The coefficient of x r in the expansion of 1-3 x -6 x 2-10 x 3- is-A- r -1B- r -1 - 2C- r -1 r -2 - 2D- r -2 - 2

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Expansions of the Form (1+x)^(-n) and (1-x)^(-n)

The coefficie...

Question

The coefficient of $x^{r}$ in the expansion of (1+3x+6 $x^{2} + 10 x^{3}$ +......) is :

(r+1)

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(r+1)/2

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(r+1)(r+2)/2

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(r+2)/2

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Solution

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