Question

The number of positive integral solutions of $abcd=210$ is

• A. $16$
• B. $64$
• C. $256$
• D. $1028$

Answer 1

The correct option is C $256$

The right option is C

$210=3\times 5\times 7\times 2$

Thus there are the $4^4$ integral solution

$4\times 4\times 4\times 4=256$