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closed with the note: I got the answer
"f:A->B &  g:C->D are 2 functions then for their composition B should be equal to C."

But if B is not equal to C then composition is possible or not? Eg:A={1,2,} B={3,4} C={4,5} D={6,7} then can fog be computed Or not?

f={(1,3), (2,4)} g={(4,6),(5,7)}

gof={(2,6)} is it true or not?

I hope my question could be understood:)
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