Question

If n (A)=30 n(B)=43and n(AUB)=70 then n(A-B)=?

Answer 1

$\huge\red{Answer}$

Let x be the value in the union

n(A) + n(B) - 2x = n(u)

21 + 43- 2x = 60

x=2

n(auB) = n(A) + n(B) -x = 21+43–2 = 62

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