Asked by  | 30th Nov, 2009, 06:27: PM

Expert Answer:

We have not understood the query that you have posted. We would request you to clarify    the II term in RHS

  nPr = (n-1)Pr + r(n-1)Pr ?

Is this r X (n-1)Pr   or   r(n-1)Pr      

so that we may answer this to the best of the ability.

Answered by  | 4th Dec, 2009, 04:07: PM

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