If `^Np_4=:^P_4=3:4`, Find N.

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Find n if ^n-1 p3:^n p4=1:9

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Find n if `^n-1P_3:^n P_4=1:9` ....

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13. If P(n-1, 2): P(n, 4) = 1 : 9, find n.