Question

$\frac{1}{1\times 2}+\frac{1}{2\times 3}+\frac{1}{3\times 4}=$

• A. 3/4
• B. 2/3
• C. 2/9
• D. 4/9

Answer 1

Answer:

A. 3/4

$\frac{1}{1\times 2}+\frac{1}{2\times 3}+\frac{1}{3\times 4}$

$=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}$

$=\frac{6+2+1}{12}$

$=\frac{9}{12}$

$=\frac{3}{4}$