Question

If n(A-B)= 18, n(A ∪B)= 70 and n(A ∩ B) = 25 then find n(B).

Answer 1

Answer:

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Hope it will helpful to you !!!

Answer 2

Step-by-step explanation:

We have n(AnB) = 25 and n(A-B) = 18

With these 2 we can calculate n(A)

n(A-B) = n(A) - n(AnB)

18 = n(A) - 25

=> n(A) = 18 + 25 = 43

:• n(A) = 43

now to calculate n(B) we can substitute all the values in equation 1

70 = 43+ n(B) - 25

70 = n(B) + 18

n(B) = 70–18 = 52

:• n(B) = 52

I hope this may help u out