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Find the coefficient of x^6y^3 in the ex...

Find the coefficient of `x^6y^3` in the expansion of `(x+2y)^9dot`

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General term of expansion `(a+b)^{n}` is
`{T}_{{r}+1}={n}_{{C}_{{r}}} {a}^{{n}-{r}} {b}^{{r}}`
For `(x+2 y)^{9}`,
Putting `{n}=9, {a}={x}, {b}=2 {y}`
...
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