Question

Find the last number of the following series
10 8 16 13 39 35

1)75
2)100
3)130
4)140​

Answer 1

The answer is 4) 140.

If we closely examine the pattern of the series, we see that after a number is subtracted by a value, it is multiplied by the same value, and then it moves on to the next natural number.

• 10 - 2 = 8
• 8 × 2 = 16
• 16 - 3 = 13
• 13 × 3 = 39
• 39 - 4 = 35

The next step, according to the pattern, would be to multiply 4.

• 35 × 4
• 140