Question

$1 + \frac{2^{2}}{1!} + \frac{3^{2}}{2!} + \frac{4^{2}}{3!} + ......\infty =$

• A. $2e$
• B. $3e$
• C. $(0.5) - \frac{(0.5)^{2}}{2} + \frac{(0.5)^{3}}{3} - \frac{(0.5)^{4}}{4} + ....$
• D. $5e$

Answer 1

Answer: (D)

$5e$

Answer 2

$x^{2}y = 2x - y$

Here $x^{2}y = 2x + y$

$x = 2y^{2} - 1$

$x^{2}y = 2x + y^{2}$.