. In the binomial expansion of (a + b)n, the coefficients of the
In the binomial expansion of (a + b)n, the coefficients of the fourth and thirteenth terms are equal to each other. Find n.
Best Answer
The coefficients of the fourth and thirteenth terms in the binomial expansion of (a + b)n are nC3 and nC12 respectively.
Coefficient of 4th term in (a + b)n = coefficient of 13th term in (a + b)n
Þ nC3 = nC12 Þ n = 15.
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