9C2 + 9C3 +10C4=?

11C4

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vineet p sahu

  • Dec 12th, 2006
 

soln: 11C4

nCr-1  + nCr = (n+1)Cr

=> (9C2 + 9C3) + 10C4 

=  (10C3) +10C4

=   11C4

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