Question

) If n(A U B) =2020, n(A)=1000, n(B)=1520 then n(A-B)=​

Answer 1

$answer$

n(A U B) = n(A ) + n(B ) - n(A - B)

2020 = 1000 + 1520 - n(A - B)

2020 = 2520 - n(A - B)

n(A - B) = 2520 - 2020

n(A - B) = 500