Q4 Q4 Prove that : Crn-1 +Crn-2 +Crn-3+ + rCr=nCr+1 - Maths - Binomial Theorem

Question

Q4

Q4 Prove that : C r n - 1   + C r n - 2   + C r n - 3 +
  +   r C r = n C r + 1

Varun Rawat · Accepted Answer

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Q4 Q4. Prove that : C r n - 1 + C r n - 2 + C r n - 3 + . . . . . . + r C r = n C r + 1 .