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

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)}

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