Find the missing number in the series given below. 3, 18, 108, ?, 3888

The correct answer is Option (3) → 648

Each term is six times the term before:

• \(3\times6=18\)

• \(18\times6=108\)

• \(108\times6=648\)

• Check: \(648\times6=3888\), the last term

So the missing number is 648.