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in Binomial Theorem by (44.0k points)
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In the following expansion, find the indicated coefficients.

x9 in (1/x + x2)18

1 Answer

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by (44.1k points)
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Best answer

Here, a = 1/x, b = x2, n = 18.

We have tr+1 = nCran-r.br

To get the coefficient of x9, we must have

x3r-18 = x9

\(\therefore\) 3r - 18 = 9

\(\therefore\) 3r = 27 

\(\therefore\) r = 9

\(\therefore\) Coefficient of x9

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