Question

The rational numbers whose multiplicative inverse is the number itself are:

• A. 1
• B. 0.0
• C. -1
• D. 2

Answer 1

Answer: (A), (C)

The correct options are
A 1
C -1

Multiplicative inverse of a number is the reciprocal of the number.
Reciprocal of 1 is $\frac{1}{1}=1$
Reciprocal of $-1$ is $\frac{1}{-1}=-1$
Hence, the required rational numbers are -1 & 1.