Question

$\frac{1}{5\times6}+\frac{1}{6\times7}+........ + \frac{1}{15\times16}=?$

• A. 1/80
• B. 1/65
• C. 1/70
• D. 1/90

Answer 1

Answer:

A. 1/80

$\frac{1}{5\times6}+\frac{1}{6\times7}+........ + \frac{1}{15\times16}$

$=\frac{1}{5} - \frac{1}{16}$

$= \frac{1}{80}$