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n (A) =n (A-B) +n (A intersection B) = (14+x)+(x) =14+2x
n (B) = n (B-A) + n (A intersection B) =(3x)+(x) =4x
n (A) =n (B)
14+2x = 4x
14 =2x
x=7
n (B) = n (B-A) + n (A intersection B) =(3x)+(x) =4x
n (A) =n (B)
14+2x = 4x
14 =2x
x=7
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