10. n(A) =20, n,(B)=18 and n(A intersection B) =5, then n(A-B) is ?

1.	10. n(A) =20, n,(B)=18 and n(A intersection B) =5, then n(A-B) is ?
Answer» 10. n(A) =20, n,(B)=18 and n(A intersection B) =5, then n(A-B) is ?

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