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If 20C(r) = 20C(r-10) than 18C(r)=...

If `20C_(r) = 20C_(r-10)` than `18C_(r)=`

A

a.4769

B

b.1512

C

c.816

D

d.480

Text Solution

Verified by Experts

The correct Answer is:
C
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HIMALAYA PUBLICATION-PERMUTATION AND COMBINATIONS-Question Bank
  1. If 15C(3r) = 15C(r+3) than r = '

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  2. If 20C(r) = 20C(r-10) than 18C(r)=

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  3. Which of the following is not correct?

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  4. If ""^nCr-84,""^nC(r-1)=36 and ""^nC(r+1)=126 , then n equals :

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  5. The value of sum(r=1)^(n)(nP(r))/(r!)=

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  6. nCr+2. nC(r-1)+nC(r-2)=

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  7. If n+2C(8):n-2P(4)=57:16 then the value of 'n' is

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