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if 4 times the number of permutaions of n things 3 together is equal to 5 times the number of permutations of n-1 things 3 together. Find n.

if 4 times the number of permutaions of n things 3 together is equal to 5 times the number of permutations of n-1 things 3 together. Find n.


 


 


 


 

Grade:11

1 Answers

sudeep joseph
16 Points
12 years ago

its answer is 15.

4(nP3) =5(n-1P3)

on solving this you will get the answer.

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