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27

Explanation:

formulae: n(A^B)=n(A)+n(B)-n(AvB)

we have to findout n(B).

n(B)=n(A^B)+n(AvB)-n(A)

=10+50-30

=30

but here 3 members are not belongs to either of club members

so, =30-3

=27.

Now we got the result

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15y ago

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