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

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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