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Evaluate .^(12)C(7)....

Evaluate `.^(12)C_(7)`.

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`.^(12)C_(7) = (12!)/(7!(12-7)!) = (12!)/(7!.5!)`
`= (8 xx 9 xx 10 xx 11 xx 12)/(1 xx 2xx 3 xx 4 xx 5)`
`= 792`.
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