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IF ""^((2n-1))P(n-1) : ""^((2n-1))Pn ...

IF `""^((2n-1))P_(n-1) : ""^((2n-1))P_n = 3:5 ` then n=

A

4

B

7

C

8

D

9

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The correct Answer is:
A
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-PRACTICE EXERCISE
  1. If ""^((n+1))P(5): ""^(n)P(5)=3:2, find n

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  2. If ""^(n)P(4):""^(n)P(3)=2:1 then is

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  3. IF ""^((2n-1))P(n-1) : ""^((2n-1))Pn = 3:5 then n=

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  4. There are 12 balls numbered from 1 to 12. The number of ways in which ...

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  5. There are 50 stations on a railway line. The number of different kinds...

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  6. The number of arrangements that can be formed by taking all the ...

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  7. The letters of the word “FLOWER” are taken four at a time and arranged...

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  8. The number of arrangements that can be formed by taking all the letter...

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  9. The different words beging and ending with a vowel that can ma...

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  10. The number of ways in which the letters of the word 'FRACTION' be arra...

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  11. The number of ways in which the letters of the word 'FRACTION' be arra...

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  12. The number of ways in which the letters of the word 'FRACTION' be arra...

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  13. The number of arrangements that can be made by using all the le...

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  14. How many ways are there to arrange the letters in the word G...

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  15. Find the number of ways of arranging the letters of the word TRIANGLE ...

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  16. The letters of the word 'MADHURI' are arranged in all possible ways. T...

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  17. The number of four digited numbers that can be formed using the digits...

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  18. The number of 5 digited numbers using 0, 1, 2,3, 4 no digit being repe...

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  19. The number of different ways in which 4 boys and 6 girls can be arrang...

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  20. The number of ways that 5 blue balls of different sizes and 5 red ball...

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