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IF ""^(12)P(r )=""^(11)P(6)+6^(11)P5, th...

IF `""^(12)P_(r )=""^(11)P_(6)+6^(11)P_5`, then r=

A

6

B

5

C

7

D

none of these

Text Solution

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-PERMUTATIONS & COMBINATIONS-EXERCISE 1A (PERMUTATIONS )
  1. IF ""^(15)P(r-1):""^(16)P(r-2) = 3 : 4 then r=

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  2. IF ""^(20)P(r):""^(20)P(r-1)=15 :1 then r=

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  3. IF ""^(12)P(r )=""^(11)P(6)+6^(11)P5, then r=

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  4. ""^(15)P(8)=A+8.""^(14)P(7 )implies A=

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  5. IF ""^((m+n))P(2) =90 ,""^((m-n))P(2) =30 then (m,n)=

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  6. A man has 3 sons and 6 schools within his reach . In how man...

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  7. The number of ways in which 3 prizes can be given away to 5 bo...

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  8. There are 50 stations on a railway line . How many different k...

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  9. The total number of signals that can be made with 7 different ...

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  10. How many permuations can be made using all the letters of the ...

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  11. The number of arrangements that can be formed by taking all the ...

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  12. The number of arrangements that can be formed by taking all the ...

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  13. The number of arrangements that can be made by taking all the ...

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  14. The number of 5 letter arrangements that can be made from the le...

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  15. The number of arrangements by arranging the letters of the word ...

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  16. The number of arrangements by arranging the letters of the word ...

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  17. The number of 3 letter words formed that containing atlest one ...

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  18. Find the number of 5 letter words that can be formed using the letters...

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  19. The number of ways of arranging 6 players to throw the cricket b...

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  20. The different words beging and ending with a vowel that can ma...

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