# Permutations and combinations

If the number of permutations of n objects taken r at a time is six times the number of combinations of n objects taken r at a time, determine the value of r. Is there enough information to determine the value of n? Why or why not?

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Denote the number of permutations of n objects taken r at a time by P(n,r), and denote the number of combinations of n objects ...

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This show show to relate permutations and combinations for given variables.

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