Discussion for Just some Permutation 3


Well this was one of the most amazing and interesting ques…
But how to derive the formula based upon the the values of N and M…
And please some one provide link for Similar ques and study material for learning that!!
Thanx in advance…

@jaythegenius : Let M = N + j .
You can put the objects 1 to j first . Then from remaining objects ( j+1 to N ) put one from the last and then one from beginning and do so till there are more objects . Based on this placement logic and normal combinatorial arguments you will be able to get to the formula .


There is a wonderful solution written already here…

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yeah thanx for that link!!

welcome… we are all here to help you.