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+1 vote

The coefficient of $x^6y^3$ in the expression $(x+2y)^9$ is

  1. $84$
  2. $672$
  3. $8$
  4. none of these
in Combinatory by Boss (17.5k points)
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1 Answer

+1 vote

The answer is option b :672


Using above formula if you put k=3 you will get value as 672

by (21 points)

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