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