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If ^(56)P(r+6):^(54)P(r+3)=30800 :1, fi...

If ` ^(56)P_(r+6):^(54)P_(r+3)=30800 :1,` find `r`.

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CENGAGE ENGLISH-PERMUTATIONS AND COMBINATIONS-All Questions
  1. In how many of the permutations of n thing taken r at a time will thre...

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  2. If ^(22)P(r+1):^(20)P(r+2)=11 : 52 ,find r

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  3. If ^(56)P(r+6):^(54)P(r+3)=30800 :1, find r.

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  4. Five persons entered the lift cabin on the ground floor of an 8-floor ...

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  5. In how many ways first and second rank in mathematics, first and secon...

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  6. Find the number of nonzero determinant of order 2 with elements 0 or 1...

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  7. Let p,q epsilon{1,2,3,4}. The number of equations of the form px^(2)+q...

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  8. Nishi has 5 coins, each of the different denomination. Find the number...

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  9. Find the number of groups that can be made from 5 different green ball...

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  10. Find the number of natural numbers which are less than 2xx10^8 and whi...

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  14. A person is permitted to selected at least one and at most n coins fro...

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  15. Let S = {1,2,3,.............. n} and A={(a ,b)"|"1lt=a ,blt=n}=SxxS. ...

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  16. A person invites a group of 10 friends at dinner and sits (i) 5 on a r...

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  17. Find the number of ways in which 10 different diamonds can be arranged...

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