Question

n(A-B)=13,n(B-A)=17,n(A)=?

Answer 1

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n (A - B) = 13
n (B - A) = 17
n (A ∪ B) = 36
n (A ∩ B) = ?
Since, we know that "A∩B" is the set containing all the elements present in both set A and set B. In this case, there are 4 elements which are present in both A and B
So, n (A ∩ B) = 4


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Answer 2

Given n(A-B)=13

And n(B-A)=17

Divide equation 1by 2 to eliminate n

$\frac{n(a - b)}{n(b - a)} = \frac{13}{17}$
....