The ratio of the coefficients of `x(4)` to that of the term independent of x in the expansion of `(x^(2)+(9)/(x^(2)))^(18)` is ____________A. `1:6`B. `3:8`C. `1:10`D. `1:8`

The ratio of the coefficients of `x(4)` to that of the term independen

1.	The ratio of the coefficients of `x(4)` to that of the term independent of x in the expansion of `(x^(2)+(9)/(x^(2)))^(18)` is ____________A. `1:6`B. `3:8`C. `1:10`D. `1:8`
Answer» Correct Answer - C In the expansion of `(ax^(p)+(b)/(x^(q)))^(n)` to find (i) the independent term, use the formula, `r=(np)/(p+q)` and (ii) the coefficient of `x^(k)`, use the formula `r=(np-k)/(p+q)`