9th Maths | Exercise 1.1 SET LANGUAGE | TN State Board | Janasruthi Ma'am

Added: 2026-06-04

[00:00:00]Hello my dear boys and girls.

[00:00:16]My dear boys and girls online Daily 7:00 9:00 even standard 2,000,999 rupees one year question one Max social 2,000 plus 2,000. So 4,000. So 3,999 same features.

[00:01:30]Fore all the best. Hello everyone. So welcome to channel exercise 1.19 standard. So I hope you can all understand so.1 sets first.

[00:02:22]So sets when we talk about sets first and that is also known as collection of welldefined elements.

[00:02:55]Collection of welldefined elements.

[00:03:08]defined well defined.

[00:03:12]So belongs to not belongs to belongs to belongs to not belongs to the symbol. So consider the set fill the balance. So belong.

[00:03:50]So belongs to belongs to.

[00:03:58]Yes. belongs to Gangi.

[00:04:04]Ganguli does not belongs to not belongs to no tender is not there. So not belongs to belongs to not belongs to yes for roasted form descriptive form and set formula.

[00:04:34]Roasted form.

[00:04:42]Roasted form.

[00:04:53]for let it be a set.

[00:05:05]So letters next.

[00:05:22]Okay, next you can put next letter for next letter to the Ns letters.

[00:05:55]assessment. Alphabet.

[00:06:04]A S E M done. So clarity added to the second one for the second question.

[00:06:34]A is equal to principle. Principle P R I N C I already P already A and L roasted form. Okay. Next.

[00:07:05]Which of the following are sets?

[00:07:10]collection well defined.

[00:07:23]So the collection of prime numbers up to 100.

[00:07:33]100 prime number.

[00:07:45]Yes. 99.

[00:07:49]Yes. No.

[00:07:53]Maybe 99 is not a prime number.

[00:08:04]So very collection is a set.

[00:08:18]This collection is a set.

[00:08:30]Okay. The collections of rich people in India. So rich people in India.

[00:08:41]So do you have any idea how it is given?

[00:08:46]So this collection of rich people in people.

[00:09:09]So this is not a set.

[00:09:16]Yes or no?

[00:09:19]So the collection of all rivers in India rivers Himalay no Ganga is a river in India. Yes.

[00:09:31]So it is a set collection of good hockey players. Hockey player.

[00:09:42]Good hockey player.

[00:09:47]Good hockey player.

[00:09:56]So you will be termed as a good hockey player.

[00:10:04]This is not a set.

[00:10:16]roasted form.

[00:10:19]So a set is equal to I N D A letter form. Okay. Next parallelogram.

[00:10:40]So par.

[00:10:45]So it is P A R L E O G R L.

[00:10:58]Okay.

[00:11:01]form.

[00:11:03]So next Mississippi A is equal to M I S P.

[00:11:22]Okay. So next check.

[00:11:26]Okay.

[00:11:28]Boring. A is equal to C is Z E H O S L V A I. Sorry. K I K I.

[00:11:53]Right. Right.

[00:11:59]So these are the very easiest exercise.

[00:12:04]Consider the following sets. A B state whether true or false. Okay. True or false?

[00:12:18]18 belongs to C. belongs to 18.

[00:12:24]18.

[00:12:26]Yes, it is true.

[00:12:30]Six not belongs to A.

[00:12:38]14 does not belongs to C. 14 C but it is there.

[00:12:45]False.

[00:12:47]10 belongs to B. 10 B.

[00:12:50]Yes, it is true.

[00:12:53]Five belongs to B.

[00:12:55]Belongs to B. No.

[00:13:01]So false. Zero belongs to B.

[00:13:06]False.

[00:13:13]Yes.

[00:13:17]Consider a set.

[00:13:23]Three belongs to three belongs to A 14 belongs to 14 belongs to C. C 18 not belongs to 4.

[00:13:44]Yes.

[00:13:46]Belongs to belongs to not belongs to represent the following in a roasted form descriptive form.

[00:14:06]Okay. So a is a set of all natural numbers even natural numbers less than 20. Even numbers natural numbers less than 20 even numbers two table. Okay. So I put 2 4 6 8 10 12 14 16 18 less than 20 equal to 20 B= Y set builder form rule Y 1 by 2 N 1 by 2 N for natural numbers.

[00:15:19]Natural numbers.

[00:15:24]N is less than or equal to 5.

[00:15:28]N is less than or equal to 5. First of all, Natural numbers natural number one.

[00:15:52]So n= 1 by 2 into 1 2 into 1 it is 2.

[00:16:08]So y = 1 by 2 into 2. So you will be having 1 by 4 add = 3 y = 1 by 2 into 3 1 by 6 = 4. Y = 1 by 2 into 4 which is 1 by 8.

[00:16:43]N = 5. Y = 1 by 2 into 5 1 by 10.

[00:16:55]Right.

[00:16:58]Statements roasted.

[00:17:14]So the B set 1 by 2, 1 by 4, 1 by 6, 1 by 8, and 1 by 10.

[00:17:29]Next C is a perfect cube number.

[00:17:36]27 cube 3 cube 3 into 3 into 3 27 3 cube 2 1 6 2 21 2 I think 6 into 6 into 6 2 and six.

[00:18:24]Yes. 64 125.

[00:18:36]So 4= x stands for integer - 5 less than x less than or equal to 2.

[00:19:01]- 5 - 4 - 3 - 2 -1 0 1 2 3 So - = -4 -3 - 2 -1 0 1.

[00:19:31]So this is your answer. Next represent the following sets in a set builder form.

[00:19:44]B is equal to set of all cricket players. cricket players cricket players who scored double centuries in one day internationals.

[00:19:56]Okay.

[00:19:59]So Bal and X X is an Indian cricket player. cricket player in India is an Indian cricket player.

[00:20:28]Okay. Who scored double centuries in Monday Internationals build first element.

[00:21:10]See nators natural numbers 1 2 3 11 natural numbers belongs to N log.

[00:21:49]Okay. So c= x c it is a natural number infinite setal number infinite set.

[00:22:14]Okay. D is equal to set of all the month months in a year.

[00:22:22]Simple D= X is a T month. X month in a year.

[00:22:43]So that the set of odd word numbers less than n whole numbers less than 9 whole numbers.

[00:22:58]So e is equal to odd whole numbers. Odd numbers.

[00:23:10]Odd numbers.

[00:23:17]Even numbers. Even numbers.

[00:23:26]Even numbers. 2 4 5 6 actually whole number starts with zero. Whole number starts with zero. So even number two even numbers odd numbers 1 2 3 5 7 2 preceding number one.

[00:24:30]So x so x is equal to 2 n -1 even numbers this n is a whole number is a whole numbers 1 2 3 4 5 less than five.

[00:25:11]So number of countings less than five x is an odd whole number less than x is an odd whole number less than n.

[00:25:52]Next, represent the following sets in a descriptive form. Descriptive form you have to say in English statements.

[00:26:02]January, June, July. Okay.

[00:26:08]Month starts with J.

[00:26:10]J.

[00:26:13]So P is a set of all English month in a year which starts with J.

[00:26:35]Starts with J.

[00:26:37]letter Q Q 7 11 13 17 19 23 2D these are prime numbers prime numbers.

[00:26:49]Okay, Q is a set of prime numbers between between five and 30.

[00:27:12]Five.

[00:27:16]Okay.

[00:27:17]31.

[00:27:21]Represent the following sets in a descriptive form. Descriptive form.

[00:27:26]English statements.

[00:27:28]So xal numbers and less than five. So r is a set of natural numbers. R is a set of natural numbers. Natural numbers set either the condition which is less than five.

[00:28:01]Yes, X is a consonants in an English alphabet. Okay. English alphabet like a consonants. So S is a set of consonants in English alphabets.

[00:28:29]So that's in the So bye-bye everyone. See you in the next exercise.

[00:28:38]Hi.

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