If S=∑i=1n  nCi−1 nCi+nCi−13=3613 then n is equal to

If S=i=1n nCi1 nCi+nCi13=3613 then n is equal to

  1. A

    11

  2. B

    12

  3. C

    13

  4. D

    10

    Fill Out the Form for Expert Academic Guidance!l



    +91



    Live ClassesBooksTest SeriesSelf Learning



    Verify OTP Code (required)

    I agree to the terms and conditions and privacy policy.

    Solution:

     nCr1+nCr=n+1Cn nCr1 nCr1+nCr=n!(r1)!(nr+1)!r!(n+1r)!(n+1)!

    =rn+1S=r=1nrn+13=1(n+1)3n2(n+1)24=n24(n+1)=3613

    13n2=144(n+1)n=12,12/13

    Thus, n=12 

    Chat on WhatsApp Call Infinity Learn

      Talk to our academic expert!



      +91


      Live ClassesBooksTest SeriesSelf Learning




      Verify OTP Code (required)

      I agree to the terms and conditions and privacy policy.