Which Number Comes Next in This Series: 2, 3, 4, 8, 9, 10, 20, 21, 22, ?


Question: Which number comes next in this series: 2, 3, 4, 8, 9, 10, 20, 21, 22, ?

The given series follows a special pattern.

Answer: The next number that comes in the series 2, 3, 4, 8, 9, 10, 20, 21, 22, is 44.

Let us find the next number in the series.

Explanation:

The series is 2, 3, 4, 8, 9, 10, 20, 21, 22

Let us break the series into groups of 3 numbers and investigate:

  • 2, 3, 4
  • 8, 9, 10
  • 20, 21, 22

The starting number of the next set is twice the last number in the previous set [ as 4 = 2 × 2 ; 8 = 4 × 2 ; 20 = 10 × 2 ]

Similarly, the next set starts with 22 × 2 which is 44.

So, the series is 2, 3, 4, 8, 9, 10, 20, 21, 22, 44, 45, 46, 92, 93, 94, ............ so on.

Thus, the next number of the series is 44.