Question

$1$ is the multiplicative identity for

• A. whole numbers
• B. integers
• C. rational numbers
• D. all the above

Answer 1

The correct option is D

all the above

Explanation for correct option:

Multiplicative identity - the whole number which, when multiplied to another whole number, results in the whole number to which it was multiplied.

For any number $a$, $a\times 1=a$,here $1$is the multiplicative identity for $a$.where $a\in \mathrm{ℝ}$

Since real number consist of all whole numbers, integers, and rational numbers

Hence,,$1$ is the multiplicative identity for whole numbers, integers, and rational numbers.

Hence, the correct option is $\left(\mathrm{D}\right)$.

Explanation for incorrect option:

Since, All the option consist of correct answer so, any one option cannot be chosen as correct option.

Hence, the correct option is $\left(\mathrm{D}\right)$.