Question

Plz Answer This Question

Choose the Correct option

a. 40
b.20
c.55
d.15
e. Other:

Answer 1

Answer:

(d) n(A) = 15

Step-by-step explanation:

Given that n(B) = 40 , n( A U B ) = 35

n( A n B ) = 20 , then n(A) = ?

we know that

n( A U B ) = n(A) +n(B) - n( A n B )

=> n(A) = n( A U B ) - n(B) + n( A n B )

=> n(A) = 35 - 40 + 20

=> n (A) = 55 - 40

=> n(A) = 15

therefore, n(A) = 15

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