Let M={7,8,9}. Determine which of the following functions is invertible for f:M→M.

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answerhappygod
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Let M={7,8,9}. Determine which of the following functions is invertible for f:M→M.

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a) f = {(7,7),(8,8),(9,9)}
b) f = {(7,8),(7,9),(8,9)}
c) f = {(8,8),(8,7),(9,8)}
d) f = {(9,7),(9,8),(9,9)}
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