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" 3.If "^((n+1))P(5):^(n)P(6)=2:7," find...

" 3.If "^((n+1))P_(5):^(n)P_(6)=2:7," find "n

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" (2)) (i) If "^((n+1))P_(5):^(n)P_(6)=2:7," find "n.

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