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If ""^(n)P(r)=30240and ""^(n)C(r)=252 ...

If `""^(n)P_(r)=30240`and `""^(n)C_(r)=252` then the ordered pair (n,r)=

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The correct Answer is:
`:.n=10`
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-ADDITIONAL SOLVED EXAMPLES
  1. Find the number of arrangements by arranging all the letters of the wo...

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  2. Find the number of ways of arranging the letters of the word 'BRINGING...

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  3. If ""^(n)P(r)=30240and ""^(n)C(r)=252 then the ordered pair (n,r)...

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  4. Find the least value of n so that ""^(n-1)C(3)+""^(n-1)C(4)gt""^(n)C(3...

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  5. Show that ""^(10)C(2)+""^(11)C(2)+""^(12)C(2)+""^(13)C(2)+......+""^...

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  6. Find the number of ways in which 3 numbers in A.P. can be selected fro...

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  7. Find the number of ways of selecting 5 objects from 9 dissimilar objec...

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  8. For a cricket trem people from one class and 8 people from ano...

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  9. How many 4 letter words can be formed using the letters of the word 'P...

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  10. Find the number of selections of 10 balls from unlimited number of red...

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  11. Find the number of selections of 10 balls from unlimited number of red...

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  12. There are 14 intermediate railway stations between Vijayawada and Hyde...

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  13. Out of 8 gentlemen and 5 ladies a committee of 5 is to be formed. Find...

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  14. There are 4 mangoes, 3 apples 2 oranges in bag, fruits of the same var...

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  15. There are 4 mangoes, 3 apples 2 oranges in bag, fruits of the same var...

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  16. There are 4 mangoes, 3 apples 2 oranges in bag, fruits of the same var...

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  17. Find the number of proper divisors of 2520. (i) How many of them are...

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  18. Find the number of proper divisors of 2520. How many of them are div...

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  19. How many selections of atleast one red ball can be made from 4 red bal...

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  20. Find the number of ordered pairs (x,y) such that L.C.M. of x and y is ...

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