Question

Show that :$\sum_{r = 0}^{n}\frac{nC_{r}}{n^{r}(r + 3)}$ = e – 2

• A. e – 1
• B. 2 – e
• C. e – 2
• D. None of these

Answer 1

Answer: (C)

e – 2

Answer 2

Q dx =

\ . .

= dx

= dx

=

= {x² (e^x) – (2x) (e^x) + 2e^x}1 0 (By successive method)

=

= e – 2.