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Find n if ""^(n-1)P(3):""^(n)P(4)=1:9....

Find n if `""^(n-1)P_(3):""^(n)P_(4)=1:9`.

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The correct Answer is:
n = 9
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NEW JOYTHI PUBLICATION-PERMUTATIONS AND COMBINATIONS-QUESTIONS FROM COMPETITIVE EXAMS
  1. Find n if ""^(n-1)P(3):""^(n)P(4)=1:9.

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  2. The number of ways in which a 7 people can sit around a round table is

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

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  4. If ""^(n)P(r)=720" "^(n)C(r), then r is equal to

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  6. The number of four-digit even numbers that can be formed using 0, 1, 2...

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  9. If n and r are two positive integers such that nger,"then "^(n)C(r-1)+...

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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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  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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  16. A polygon has 54 diagonals. Number of sides of this polygon is

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  17. In how many ways can 8 students be arranged in a row?

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