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Find r : ""^(5) P(r) =42 ""^(6)P(r-1)...

Find `r : ""^(5) P_(r) =42 ""^(6)P_(r-1)`

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The correct Answer is:
(i) r = 13, (ii) r = 6
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KUMAR PRAKASHAN-PERMUTATIONS AND COMBINATIONS-PRACTICE WORK
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