Answers

  • Brainly User
2015-05-12T12:13:26+05:30
PCr = pC1 +pC2 + ...............................pCr 
PCr =  P!/(p-1) + P!/ (p-2)! ............P! /(p-r) !
p!/(p-r)= P!/(p-1)(p-2)(p-3).........(p-r)
p!/(p-r)=P! /P(p-1)....................... 

this shows that p divide PCr

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