Let n(A – B)= 25 +x, n(B – A)= 2x and n(A(ThB)= 2x. Ifn(A) = 2(n(B)) then find ‘x’ – Sets Problem

Sol:    n(A) n(A-B)+n(A1’-B)
25+x+2x=25+3x
n(B)= n(B-A)+n(AB)=  2x+2x=4x
n(A) = 2(n(B))
25+3×2(4x)8x-3x=255×25 x5