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    Let A and B be finite non-empty sets with the number of elements in  A=m and number of elements in B=n.Let m>n.If for some integer k>=1,the number of non-empty subsets of A=2^k+number of non-empty subsets of B,then which one of the following is correct?

  • m=n+2
  • m=n+1
  • m=n+p for some odd prime number p
  • m=n+t for some composite number t