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Find the number of divisors of 720. How ...

Find the number of divisors of 720. How many of these are even? Also find the sum of divisors.

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CENGAGE PUBLICATION-PERMUTATIONS AND COMBINATIONS-All Questions
  1. Find the number of odd proper divisors of 3^pxx6^mxx21^ndot

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  2. lf r, s, t are prime numbers and p, q are the positive integers such t...

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  3. Find the number of divisors of 720. How many of these are even? Also f...

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  4. In an examination of nine papers, a candidate has to pass in more pa...

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  5. How many different signals can be given using any number of flags from...

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  6. A student is allowed to select at most n books from a collection of (2...

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  7. In how many ways can 6 persons stand in a queue?

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  8. In an election, the number of candidates is one greater than the per...

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  9. Out of 10 white, 9 black, and 7 red balls, find the number of ways in ...

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  10. Two players P1a n dP2 play a series of 2n games. Each game can resul...

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  11. Find the number of ways in which 8 different flowered can be strung to...

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  12. Ten IIT and 2 DCE students sit in a row. The number of ways in whic...

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  13. If "^(2n+1)P(n-1):^(2n-1)Pn=3:5, then find the value of n.

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  14. A team of four students is to be selected from a total of 12 studen...

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  15. If "^9P5+5*^9P4=^(10)Pr , find the value of r.

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  16. There are 2 women participating in a chess tournament. Every partic...

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  17. Seven athletes are participating in a race. In how many ways can the ...

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  18. Two teams are to play a series of five matches between them. A matc...

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  19. Prove that if rlt=slt=n ,t h e n^n Ps is divisible by ^n Pr .

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  20. The number of even divisor of the number N=12600=2^3 3^2 5^2 7 is a. ...

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