Question

The reciprocal ratio of $\frac{1}{a}:\frac{1}{b}$ is

• A. 1b:1a
• B. $a:b$
• C. $b:a$

Answer 1

The correct option is B $a:b$

Note that the reciprocal ratio of $a:b$ is $\frac{1}{a}:\frac{1}{b}$
$⟹$ The reciprocal ratio of $\frac{1}{a}:\frac{1}{b}$ is $\frac{1}{\frac{1}{a}}:\frac{1}{\frac{1}{b}}=a:b$