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Find the value of r if 5 xx 4Pr = 6 xx...

Find the value of r if
`5 xx 4P_r = 6 xx 5P_(r-1)`

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MAXIMUM PUBLICATION-PERMUTATION AND COMBINATIONS-EXAMPLE
  1. Find the value of n such that nP5=42 xx nP3,n>4

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  2. Find the value of n such that (n-1)P3 : nP4=1:9

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  3. Find the value of r if 5 xx 4Pr = 6 xx 5P(r-1)

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  4. Find the value of r if 5Pr = 6P(r-1)

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  5. The letters of the word TUESDAY are arranged in a line, each arrangeme...

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  6. The letters of the word TUESDAY are arranged in a line, each arrangeme...

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  7. Consider the word ANNAMALAI How many new words can be formed using t...

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  8. Consider the word ANNAMALAI Among the new words how many of them wil...

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  9. Find the rank of the word NAAGI, if these words are written as in a di...

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  10. A committee of 3 persons is to be constituted from a group of 2 men an...

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  11. A committee of 3 persons is to be constituted from a group of 2 men an...

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  12. It was found at a certain dinner meeting that after every member had s...

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  13. In an exam, Arjun has to select 4 questions from each part. There are ...

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  14. Find the number of different 8-letter arrangements that can be made fr...

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  15. Find the number of different 8-letter arrangements that can be made fr...

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  16. How many permutations are there of the 11 letters in MISSISSIPPI ta...

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  17. How many permutations are there of the 11 letters in MISSISSIPPI al...

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  18. Find the number of arrangements of 6 boys and 5 girls in a row so that...

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  19. Find the number of arrangements of 6 boys and 5 girls in a row so that...

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  20. If the letters of the word DHRONA be permuted and arranged as in a dic...

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