Question

Which of the following is a repeating decimal with $21$ as repeating digits?

• A. $\mathrm{7.213213...}$
• B. $\mathrm{6.212121...}$
• C. $\mathrm{8.2131313...}$
• D. $21$

Answer 1

The correct option is B $\mathrm{6.212121...}$

$\mathrm{7.213213...}$ is a repeating decimal with 213 as repeating digits.

$\mathrm{6.212121...}$ is a repeating decimal with 21 as repeating digits.

$\mathrm{8.2131313...}$ is a repeating decimal with 13 as repeating digits.

$21$ is a terminating decimal.