Question

Multiplicative inverse of $-\frac{21}{8}$ is

• A. $\frac{8}{21}$
• B. $-\frac{8}{21}$
• C. $\frac{21}{8}$
• D. $-\frac{21}{8}$

Answer 1

The correct option is B $-\frac{8}{21}$

Multiplicative inverse of a number is that number which when multiplied with the given number, gives 1.
Multiplicative inverse of $-\frac{21}{8}$ is $-\frac{8}{21}$, since $-\frac{21}{8}\times -\frac{8}{21}=1$