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Find r if "^5Pr = "^6P(r-1)....

Find r if `"^5P_r `= `"^6P_(r-1)`.

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Find r if "^5P_r =2 "^6P_(r-1) .

Find r if : "^10P_r= 2^9P_r .

Find the value of r if 5. ^4P_r= 6. "^5P_(r-1) .

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PSEB-PERMUTATIONS AND COMBINATIONS-EXERCISE
  1. Find n if "^(n-1)P3 : "^nP4 =1:9.

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  2. Find r if "^5Pr =2 "^6P(r-1).

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  3. Find r if "^5Pr = "^6P(r-1).

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  4. How many words, with or without meaning, can be formed using all the l...

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  5. How many words, with or without meaning can be made from the letters o...

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  6. How many words, with or without meaning can be made from the letters o...

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  7. How many words, with or without meaning can be made from the letters o...

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  8. In how many of the distinct permutations of the letters in MISSISSIPPI...

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  9. In how many ways can the letters of the word PERMUTATIONS be arranged ...

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  10. In how many ways can the letters of the word PERMUTATIONS be arranged ...

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  11. In how many ways can the letters of the word PERMUTATIONS be arranged ...

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  12. If "^nC8 = "^nC2 , find "^nC2 .

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  13. Determine n if "^(2n)C3 : "^nC3 =12:1

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  14. Determine n if "^(2n)C3 : "^nC3 = 11 : 1

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  15. How many chords can be drawn through 21 points on a circle?

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  16. In how many ways can a team of 3 boys and 3 girls be selected from 5 b...

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  17. Find the number of ways of selecting 9 balls from 6 red balls, 5 white...

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  18. Determine the number of 5 card combinations out of a deck of 52 cards ...

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  19. In how many ways can one select a cricket team of eleven from 17 playe...

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  20. A bag contains 5 black and 6 red balls. Determine the number of ways i...

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