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If A = {1, 2, 3, 4, 5, 6}, show that the...

If A = {1, 2, 3, 4, 5, 6}, show that the relation
`f={(x,y):x+y=7},` for all `x,y in A`
defines a mapping from A to itself but the relation `g={(x,y):x+y gt8}` does not define a mapping in set A.

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