Question

 If  n (A) = 15, n (A ∪  B ) =  29,  n (A ⋂ B) = 7 then  n (B)  =  ?​

Answer 1

Step-by-step explanation:

ans n(AuB)= n(A)+n(B)-n(AnB)

29=15+n(B)-7

29=8+n(B)

29-8=n(B)

. n(B)= 21

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Answer 2

Step-by-step explanation:

we know that,

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

here,

n(A)=15,n(AUB)=29,n(AnB)=7,n(B)=?

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

=29+7-15

=21

so,

n(B)=21

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