Question

Which number should replace the question mark?

• A. $1$
• B. $731$
• C. $1625$
• D. $2031$

Answer 1

Answer: (D)

$2031$

We have : $3\times 5+1=16$,
$16\times 5+1=81,81\times 5+1=406$.
So, missing number $=406=406\times 5+1=2031$.