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Let a={1,2},B={0} then which of the foll...

Let `a={1,2},B={0}` then which of the following is correct
a.Number of possible relations from `AtoB` is `2^0=1`
b.Number of void relations from `AtoB` is not possible
c.Number of possible relations from `AtoB` are 4
d.Number of possible relations are equal to `2^(n(A)+n(B))`

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