Question

In the expansion of $\frac{e^{5x} + e^{x}}{e^{3x}}$, the coefficient of $x^{4}$is.

• A. – $6/5$
• B. 4/3
• C. – 4/3
• D. None of these

Answer 1

Answer: (B)

4/3

Answer 2

$\frac{a + bx}{e^{x}}$

Coefficient of$x^{r}$.