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Find the value of n such that ""^(n)P(5)...

Find the value of n such that `""^(n)P_(5)=42.""^(n)P_(3),ngt4`.

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The correct Answer is:
n = 10
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NEW JOYTHI PUBLICATION-PERMUTATIONS AND COMBINATIONS-QUESTIONS FROM COMPETITIVE EXAMS
  1. Find the value of n such that ""^(n)P(5)=42.""^(n)P(3),ngt4.

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  3. There are (n + 1) white and (n + 1) black balls, each set numbered 1 t...

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  10. If ""^(4)C(r)=""^(4)C(r+1), then the value of r is

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  11. The number of straight lines that can be formed by joining 20 points o...

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  12. The number of ways in which a committee of 6 members can be formed fro...

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  13. Evaluate the following: ""^(20)C(4)=

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  14. Let N be the number of quadratic equations with coefficients from {0, ...

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  15. If ""^(n)C(3)=220, then n = ?

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