Question

A and B are two sets such that n ( A-B)=14+x ,n (B-A )=3x and n (A intersection B)=x. also find n (A union B)​

Answer 1

(A-B) =14+x

(B-A) = 3x

n(A intersection B)= x

look

we know that

n(A - B) = n(A ) - n(A intersection Between)

n (A) = 14+ x+ x

n(A) = 14 + 2x

14=2x

x= 14/2

x= 7

=