MATHS TRUE / FALSE

If A and B are two sets such that A ⇔ B, then A = B. (False)
Correct : A = B is A ⇔ B but A ⇔ B is not always A = B

If set A = {0}, then n{A} = 0. (False)
Correct : {n(A) = 1}

An empty set is a subset of every set. (True)

If A is any set, then A ⊂ A. (True)

If P= {letters of the word AHMEDABAD}, then n(P) = 6. (True)
{A, H, M, E, D, B}

If X = {letters of the word PRINCIPAL}, then the cardinal number of set X is 9. (False)
Correct : n(x) = P, R, I, N, C, A, L = 7 not 9

A collection of books is a set. (False)
Correct : A collection of different books is a set.