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sudeep joseph Grade: 11
        

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.


 


 


 


 

7 years ago

Answers : (1)

sudeep joseph
16 Points
										

its answer is 15.


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


on solving this you will get the answer.

7 years ago
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