Question

25. If S and T are two sets such that S has 21 elements, T has 32 elements and ST has
11 elements, how many elements does SUT have ?​

Answer 1

the ans is 42 elements .

steps are there.

i hope it will help you

Step-by-step explanation:

n(S)= 21, n(T) = 11

We know that:

n(SUT) = n(S)+ n(T) - n (S n T)

.

. . n(SUT) = 21 + 32 - 11 = 42

THUS, the set ( S U T) has 42 elements.