If some three consecutive in the binomial expansion of

Question:

If some three consecutive in the binomial expansion of $(x+1)^{n}$ is powers of $x$ are in the ratio $2: 15: 70$, then the average of these three coefficient is :-

  1. 964

  2. 625

  3. 227

  4. 232


Correct Option: , 4

Solution:

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