code and decode simple order and reverse by kk yadav

Hinzugefügt: 2026-05-25

[00:00:01]Hello students, I KK Ado welcomes you all in our today's class. Today we will cover code and decode.

[00:00:10]Code and decode as name suggest code and decode we are using in our day-to-day life. For example, we are using our cell phone.

[00:00:31]We are using cell phone.

[00:00:34]We say hello.

[00:00:37]Same word will be audible to the person to whom you have connected.

[00:00:44]How this happens? Possible the same word will be audible there. There's no legal connection, no wire connection.

[00:00:55]Okay. This sound hello sound is converted into signal.

[00:01:07]This is known as coding.

[00:01:11]This is known as coding.

[00:01:15]Again the person to whom you have connected receive this signal and this signal will convert again into sound.

[00:01:30]Conversion of sound into signal is coding and conversion of signal into sound is decoding.

[00:01:40]This process follows.

[00:01:46]This is decoding.

[00:01:52]In same way we are using computers.

[00:01:57]We are writing nine 1 0 0 1. This is 9 in binary form.

[00:02:10]This is nine in binary form.

[00:02:14]In binary we are using only two digit to write any number that is 0 and 1.

[00:02:20]1 double is 2, double is 4 again double is 8.

[00:02:31]This is useful for us.

[00:02:38]This will be eight. This is not useful.

[00:02:40]We have written zero. This is not useful. We have written zero. This is 1.

[00:02:45]8 + 1 is 9.

[00:02:55]When you add these numbers, this will be nine. Conversion of one number system into another number system is also known as coding.

[00:03:05]Conversion of some sound into some signal and reverse of signal into sound is decoding.

[00:03:15]We are facing these coding and decoding in daytoday life.

[00:03:21]we will study related to our syllabus.

[00:03:28]I am writing the logics here.

[00:03:34]Logics of coding and decoding.

[00:03:37]Number one, simple order.

[00:03:49]Number two, reverse order.

[00:04:00]Number three, key type.

[00:04:07]Number four, mix key.

[00:04:17]Number five, conditional.

[00:04:29]Number six, substitution.

[00:04:38]Number seven.

[00:04:46]Swapping.

[00:04:51]Number eight.

[00:04:58]Number system.

[00:05:06]Number nine.

[00:05:20]matrix form number 10.

[00:05:29]We will cover miscellaneous Number 11, we will cover option elimination.

[00:06:06]I hope it's visible now. Note down, take your time.

[00:06:13]Then we will proceed one by one.

[00:06:17]Note down first.

[00:06:29]Okay. You have to write these letters.

[00:06:35]What is difference between alphabet and alphabets?

[00:06:40]Alphabet mean group of 26 letters. If you are talking about English alphabet, group of 26 letters.

[00:06:55]Group of 26 letters is known as alphabet. and alphabets mean language.

[00:07:01]If I say I don't know the English alphabets, it means I don't know English language.

[00:07:08]The group of 26 letters is known as alphabet, not alphabets.

[00:07:13]Group of students is known as class, not classes.

[00:07:17]The group of 26 letter is alphabet.

[00:07:20]Alphabets mean language.

[00:07:23]Okay. You have to write the numbers 1 2 3 4 5 up to zone 13.

[00:07:37]Let me change this to pencil. 1 2 3 4 5 6 7 8 9 10 11 12 13 you have to write 13 till here.

[00:07:59]After then you have to write 14 below 13. You have to write 14 below 13.

[00:08:04]14 15 16 17 18 19 20 21 22 23 24 25 26.

[00:08:23]You have to write letters between them.

[00:08:25]A B C D E F G H I J K L M N O P Q R S T U V W X Y yet why I have written if you add the numbers 13 + 14 that is 27 12 + 15 again 27 11 + 16 27 10 + 17 27 9 + 18 27 8 + 19 27 26 + 1 27 25 + 2 27 24 + 3 27 23 + 4 27 22 + 5 27 27 21 + 6 27 everywhere sum is 27. Logic number one.

[00:09:30]Logic number two. If a is first from starting, a should be 26th from last. If we start counting from here, then a should be 26th. It means a can be ranked as 1. A can be ranked as 26.

[00:09:48]B can be ranked as two. B can be ranked as 25. C can be ranked as three. C can be ranked as 24. If we start counting from last, then C will be 24. If you know the number three, subtract from 27.

[00:10:03]27 - 3 is 24. We will able to calculate the ranks from both sides from front from back. We are comfortable in both.

[00:10:15]Now how to learn these ranks? If you observe this is seven.

[00:10:20]This is seven.

[00:10:22]Am I clear? Seven is here. Seven is here. You are able to remember G is seven. 8. If you observe digital lights, yeah, red lights 8 is written in this form.

[00:10:41]Digital 8. H. If you remove this part and this part, this will be H. You will able to recognize H is 8.

[00:10:52]I 9 after in play cards after 10 number is not there J is there okay we will remember these letters by some words let's say G4 GT road 7 is G G4 GT road what will I add to seven to make it 27 we will add 20 it means G is seven from starting. G is 20 from last. T is 20 from starting. T is seven from last. The number Nearby starting G4 GT road.

[00:11:50]Same way. 8 H SS Hana circar.

[00:11:58]Hana circar.

[00:12:03]H S I 9 I I R Indian Railway 9 + 18 is 27 I4 Indian Railway You have to repeat after me. I for Indian Railway, G4 GT road, H4 Hana, I for Indian Railway. After 10, After 10, J is there. Opposite to J is Q is there. Jack and queen. J Q in play cards. After 10, J is there.

[00:12:41]10 + 17 27 to Jack and queen 11 Kings 11 Punjab in IPL team is there Kings 11 Punjab Kings 11 Punjab although now name has changed but you have to remember 11 Kings 11 Punjab 12 L O 12 + 15 is 27 low order we usually say you we have to maintain low order police maintain low order 24 hours low order 12 hours low order maintain please 12 hours low order maintain please three this is three 13 this is look like m MN 13 + 14 is 27 7 midnight.

[00:13:45]We used to say A to G A to Z. Y A to Z 1 + 26 27 A2 Z.

[00:13:59]Bye-bye.

[00:14:01]We used to say bye-bye. B Y Bye-bye.

[00:14:06]CX cracks DW door window.

[00:14:10]EVS EVS to complete pairs learn you will able to learn them ranks right now.

[00:14:35]Please note down fast.

[00:14:40]Zoom.

[00:14:43]Zoom in.

[00:15:00]Please note down first then we'll proceed further.

[00:15:08]Okay, let's try some questions.

[00:15:13]If tiger is coded as tiger is coded as U J H F S then lo will be coded as you have to tell the code of line. If you observe after t u is there t is 20 u is 21. If you write the ranks 9 7 5 18 21 10 8 6 19 20 21 9 10 5 6 7 8 18 19 We have written next letter. We know after L M M is there. After I after I J is there. After O, O is 15. 16 is P.

[00:16:34]After N, O is there. Rank is 12 9 15 14 13 10 16 15 12 + 1 13 9 + 1 10 15 + 1 16 14 + 1 15 Note down first if tiger is coded as this tiger this is different tiger is coded as U K J I W. Then what will be the code for line?

[00:17:22]We are doing first type simple order.

[00:17:33]If you observe this is T is 20, U is 21.

[00:17:37]1 is added here.

[00:17:40]I is 9, K is 11, 9 + 2, 2 is added here.

[00:17:47]G is 7, J is 10, 7 + 10, uh, 3, 10, 3 is added here.

[00:17:56]E is 5, I is 9, 5 + 4 is 9, + 4 is added here. + 5 18 + 5 23.

[00:18:10]In same way you have to write the code for line. L is 12. 12 + 1 13 is M.

[00:18:18]I is 9. 9 + 2 is 11. 11 is K. O is 15.

[00:18:26]15 + 3 is 18.

[00:18:29]18 is R. N is 14. 14 + 4 is 18. Again R.

[00:18:35]The code will be this. What is logic here? Simple order increasing pattern. + 1 + 2 + 3 + 4 up to so on. It depend on numbers letters. If five letters are there, we are adding up to five. If four letters are here, we are adding up to four.

[00:18:54]Next, in simple order, if tiger is coded as tiger is coded as 59, then what will be the code for line?

[00:19:21]If tiager is coded as 59 then what will be the code for lines? If you observe 59 20 + 7 27 9 + 18 27 27 + 27 54 54 + 5 59 it means we added their ranks. We added their ranks. Same way we write their ranks 12 9 15 14. If we add them 15 + 14 29 29 + 9 38 38 + 12 50 The answer would be 50. Note down fast.

[00:20:04]Okay. We will do here only reverse order.

[00:20:14]Tiger same is coded as this is G R T V I then what will be the code for line?

[00:20:38]If you have written that those letters alphabets in pattern open that and then you will come to know G and T GT road GT road GT T road Indian Railway I R words GT road E V S five R I Indian Railway I R Indian Railway same way L O Lord Indian railway Okay.

[00:21:09]Low order midnight. MN midnight.

[00:21:14]Okay. Second, if tiger is coded as S, G, J, M, Y. Then what will be the code for line?

[00:21:37]Try yourself. Pause the video and try yourself. If you write the ranks, 18, this is 19.

[00:21:47]5, this is 7.

[00:21:50]This is 7, this is 10 + 1 + 2. 5 + 2 7 + 3 10.

[00:22:03]Last current first related last letter is related to first letter that's why we are saying it reverse the same way m + 1 m is 14 14 + 1 15 is o + 2 17 + 3 12 + 4 16.

[00:22:33]Please note down we have covered two types simple order and reverse order.

[00:22:39]We will cover the rest in upcoming lectures.

[00:22:46]Till then bye-bye. Take care. Keep supporting us. Thank you.