If P(n ,4)=20 x P(n ,2),find n....

If P(n ,4)=20 x P(n ,2),find n.

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RD SHARMA ENGLISH-PERMUTATIONS-All Questions

If P(n ,4)=18xxP(n ,3), find n
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If P(n ,4)=20xxP(n ,2), then find the value of n
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If P(n ,4)=20 x P(n ,2),find n.
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In how many ways can 6 persons stand in a queue?
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