If some three consecutive coefficients in the binomial expansion of (x – InterviewSolution

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

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