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Find n if: (a) ""^(6)P(2) = n ""^(6)C(...

Find n if:
(a) `""^(6)P_(2) = n ""^(6)C_(2)`
(b) `""^(2n)C_(3): ""^(n)C_(2) = 52:3`
( c) `""^(n)C_(n-3) = 84`

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The correct Answer is:
a) n=2, b) n=7, c) n =9
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