Question

If every element of set X is in set Y then_____________

(a) X⊂Y

(b) Y⊂X

(c) X=Y

(d) X≠Y

I had been asked this question in exam.

Question is from Subsets in section Sets of Mathematics – Class 11

Answer 1

Correct option is (a) X⊂Y

Easiest explanation: If every element of set X is in set Y then X is called subset of Y.  X⊂Y.

But every element of Y may or may not be the element of X so we can’t say Y⊂X and hence we can’t decide equality.