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Evaluate (n!)/((n-r)!) , when n= 9,r= 5....

Evaluate `(n!)/((n-r)!)` , when n= 9,r= 5.

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PSEB-PERMUTATIONS AND COMBINATIONS-EXERCISE
  1. If 1/(6!)+1/(7!)=x/(8!), find x

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  2. Evaluate (n!)/((n-r)!) , when n= 6, r= 2

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  3. Evaluate (n!)/((n-r)!) , when n= 9,r= 5.

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  4. How many 3-digit numbers can be formed by using the digits 1 to 9 if n...

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  5. How many 4-digit numbers are there with no digit repeated?

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  6. How many 3-digit even numbers can be made using the digits 1, 2, 3, 4,...

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  7. Find the number of 4-digit numbersthat can be formed using the digits ...

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  8. From a committee of 8 persons, in how many ways can we choose a chairm...

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  9. Find n if "^(n-1)P3 : "^nP4 =1:9.

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  10. Find r if "^5Pr =2 "^6P(r-1).

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  11. Find r if "^5Pr = "^6P(r-1).

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  12. How many words, with or without meaning, can be formed using all the l...

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  13. How many words, with or without meaning can be made from the letters o...

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  14. How many words, with or without meaning can be made from the letters o...

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  15. How many words, with or without meaning can be made from the letters o...

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  16. In how many of the distinct permutations of the letters in MISSISSIPPI...

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  17. In how many ways can the letters of the word PERMUTATIONS be arranged ...

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  18. In how many ways can the letters of the word PERMUTATIONS be arranged ...

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  19. In how many ways can the letters of the word PERMUTATIONS be arranged ...

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  20. If "^nC8 = "^nC2 , find "^nC2 .

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