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2016-05-04T18:34:07+05:30
The no. of elements in {b} is the no. of elements in A. 
Since, it is one-one fucntion.
One-One function is that function whose domain and range have equal no. of elements as each element of A is connected to only one element of B. Elements of A has only one image in B
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Explain it that how u come to this point?
please mark it BRAINLIEST i need it.