Q4 of 23 Page 38

If A and B are two sets such that then what is

We know that if all elements of set A are present in B, then A is said to be subset of B denoted by A ⊂ B.


We know that the union of A and B is the set which consists of all the elements of A and B.


⇒ A ⋃ B = B ⋃ B = B


Ans. A ⋃ B = B


More from this chapter

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2

A = {0, 2, 4}, find and Comment.

 3

If A = {2, 4, 6, 8, 10} and B = {3, 6, 9, 12, 15}, find A – B and B – A.

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If A = {x : x is a natural number}, B = {x : x is an even natural number} C = {x : x is an odd natural number} and D = {x : x is a prime number} Find A B, A C, A D, B C, B D, C D.

 6

If A = {3, 6, 9, 12, 15, 18, 21}; B = {4, 8, 12, 16, 20} C = {2, 4, 6,8, 10, 12, 14, 16}; D = {5, 10, 15, 20} find

(i) A – B (ii) A – C


(iii) A – D (iv) B – A


(v) C – A (vi) D – A


(vii) B – C (viii) B – D


(ix) C – B (x) D – B