Question

5lt n (AUB) = 15 and n(AnB)=2 and and n(A)=10 then n(B) = ?
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Answer 1

Step-by-step explanation:

n (AUB) = 15

n(AnB)=2

n(A)=10

n(B) = ?

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

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

= 15 +2 -10

=17-10

=7