Question

1 point
If n(A) = 25, n(B) = 15, n(A/B)
30, then n(ANB) = *​

Answer 1

Step-by-step explanation:

We know that

n(A∪B)=n(A)+n(B)−n(A∩B)

Here we are given with

n(A)=7,n(B)=5,n(A∪B)=11

Substitute these values in the above formula.

11=7+5−n(A∩B)

⟹n(A∩B)=12−11=1

∴n(A∩B)=1

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