Question

The middle term in the expression of $12a^{11}b$ is.

• A. $(x + a)^{n}$
• B. $x^{n - r}a^{r}$
• C. $x^{r}a^{n - r}$
• D. $x:a$

Answer 1

Answer: (B)

$x^{n - r}a^{r}$

Answer 2

If n is even.

$\frac{1}{n + 1}$Middle term is 10^th term.

⇒ $\frac{1}{n - 1}$.