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If functions f and g are given by f = ...

If functions f and g are given by
`f = {(1, 2), (3, 5), (4, 6)}` and
`g = {(2, 3), (5, 1), (6, 3)}`. write down the functions fog and gof.

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The correct Answer is:
fog is not defined, `gof = {(1,6), (3,4),(4,3),(2,1)}`
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If the mappings f and g are given by f={(1,2),(3,5),(4,1) and g={(2,3),(5,1),(1,3)}, then write fog.

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