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Find\ x in each of the following: x/(10 ...

Find`\ x` in each of the following: `x/(10 !)=1/(8!)+1/(9!)`

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RD SHARMA ENGLISH-PERMUTATIONS-All Questions
  1. Prove that: 1/(9!)+1/(10 !)+1/(11 !)=(122)/(11 !)

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  2. Find\ x in each of the following: 1/(4!)+1/(5!)=x/(6!)

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  3. Find\ x in each of the following: x/(10 !)=1/(8!)+1/(9!)

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  4. Find\ x in each of the following: 1/(6!)+1/(7!)=x/(8!)

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  5. Convert the following products into factorial: 5. 6. 7. 8. 9. 10

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  6. Convert the following products into factorial: 3.6.9.12.15.18

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  7. Convert the following products into factorial: (n+1)(n+2)(n+3).......(...

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  8. Convert the following products into factorial: 1. 3. 5. 7. 9 (2n-1)

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  9. Which of the following are true: (2+3)!=2!+3!

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  10. Which of the following are true: \ (2xx3)! =2!xx3!

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  11. Prove that: n !(n+2)=n !+(n+1)!

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  12. if(n+2)! =60[(n-1)]!,find n

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  13. If (n+1)! =90[(n-1)!], fin d n

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  14. If (n+3)! =56[(n+1)! ] find n

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  15. Prove that ((2n+1)!)/(n !)=2^n{1. 3. 5 .........(2n-1)(2n+1)}

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  16. There are 3 candidates for a classical, 5 for a Mathematical,, and 4 ...

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  17. The flag of a newly formed forum is in the form of three blocks, each ...

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  18. Find the number of 4 letter words, with or without meaning which can b...

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  19. Given 4 flags of different colours, how many different signals can be ...

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  20. Find the number of different signals that can be generated by arrangin...

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