Question

Write which number replaces the questions mark in the sequence.

$2,9,38,155,?$

• A. $315$
• B. $193$
• C. $623$
• D. $624$

Answer 1

The correct option is D $624$

The given sequence $2,9,38,155$ follow a pattern :
$2\times 4+1=9$
$9\times 4+2=38$
$38\times 4+3=155$
$155\times 4+4=624$.

Hence, $624$ replaces the question mark.