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Evaluate : ""((12!)-(10!)) / (9!)...

Evaluate : `""((12!)-(10!)) / (9!)`

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The correct Answer is:
1310
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KUMAR PRAKASHAN-PERMUTATIONS AND COMBINATIONS-PRACTICE WORK
  1. Prove that (n!) (n + 2) = [n! + (n + 1)!]

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  2. if 1/(7!)+1/(9!) =x/(10!) then find x.

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  3. Evaluate : ""((12!)-(10!)) / (9!)

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  4. How many words can be formed out of the letters of the word VOWEL. So...

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

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  6. How many words can be made form the letters of the word DAUGHTER assum...

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  7. How many three-digit numbers can be made using the digits 0, 1, 2, …, ...

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  8. From a committee of 10 persons, in how many ways can we choose a chair...

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  9. How many 3-digit even numbers that can be formed using the digit 2,4,6...

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  10. Find r : ""^(5) P(r) =42 ""^(6)P(r-1)

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  11. Prove that , ""^nPr = ""^((n-1))Pr + r. ""^(n-1)P((r-1))

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  12. If ""nPr=840 and ""^nCr=35, then r is equal to....

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  13. If ""^((n+2)) C8 :"" ^((n-2)) P4= 57 : 16 then find n.

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  14. If ""^nC10= ""^nC12 then find ""^23Cn.

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  15. In how many ways can a football team of 11 players be selected from 16...

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  16. A committee of 7 has to be formed from 9 boys and 4 girls. In how many...

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  17. A polygon has 65 diagonals, then find the number of its side.

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  18. What is the number of ways of choosing 4 cards from a pack of 52 play...

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  19. How many four digit numbers divisible by 4 can be made with the digit ...

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  20. How many different words can be formed by using all the letters of the...

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