Question

Choose the factor pair of 210 which has only composite numbers.

• A. $14\times 15$
• B. $3\times 70$
• C. $2\times 105$
• D. $7\times 30$

Answer 1

The correct option is A $14\times 15$

210 can be expressed as
$3\times 702\times 1057\times 3010\times 2114\times 15$

Among these factor pairs, $14\times 15\&10\times 21$, both factors are composite numbers.

Hence, $14\times 15$ is the correct option among given options.