Question: Show that directly, i.e. without induction. In doing so, also prove the identity -WI (n - 1)!y (n-y)!ny 1

Show that

-WI (n - 1)!y (n-y)!ny 1

directly, i.e. without induction. In doing so, also prove the identity

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-WI (n - 1)!y (n-y)!ny 1

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