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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:
(1) 964 (2) 232 (3) 227 (4) 625
$n = 16, r = 2$. Average $= (16 + 120 + 560)/3 = 232$.
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