Question

1. If n(A) = 15, n(AU B) = 29, n(An B) = 7,then n(B) = ?​

Answer 1

Answer:

Answer is 21.

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Step-by-step explanation:

Given,

n(A) = 15

n(AUB) = 29

n(AnB) = 7

To find

n(B) = ?

We know,

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

=> 29 = 15 + n(B) -7

=> 29 = n(B) + 8

=> n(B) = 29-8

=> n(B) = 21