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" by "13" show that an onto function "f:...

" by "13" show that an onto function "f:{1,2,3}rarr

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Show that an onto function f : {1, 2, 3} rarr {1, 2, 3} is always one-one.

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Show that a one-one function f : {1, 2, 3} rarr {1, 2, 3} must be onto.

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If A={1,2,3}, show that an onto function f:A rarr A must be one-one

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Show that an onto function f: {1,2,3} to {1,2,3} is always one-one.

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