Question

Find:

$\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}=$

• A. 0.625
• B. 0.875
• C. 1.125
• D. 0.785

Answer 1

Answer:

B. 0.875

$\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}$

$=\frac{1\times5}{2\times5}+\frac{1\times25}{4\times25}+\frac{1\times125}{8\times125}$

$=\frac{5}{10}+\frac{25}{100}+\frac{125}{1000}$

$=0.5+0.25+0.125$

$=0.875$