• Numerical Ability - Number Series
Question

15, 16, 34, 105, 424, 2124, 12756

  • A) 16
  • B) 34
  • C) 105
  • D) 424
  • E) 2124
Solution

Answer: (E)

Explanation:

2nd term = (1st term) * 1 + 1 = 15 *1 + 1 = 16.

3rd term = (2nd term) * 2 + 2 = 16 * 2 + 2 = 34

4th term = (3th term) *3 + 3 = 34 * 3 + 3 = 105

5th term = (4th term) * 4 + 4 = 105 * 4 + 4 = 424

6th term = (5th term) * 5 + 5 = 424 * 5 + 5 = 2125

6th term should 2125 instead of 2124.

Answer: (E)

Explanation:

2nd term = (1st term) * 1 + 1 = 15 *1 + 1 = 16.

3rd term = (2nd term) * 2 + 2 = 16 * 2 + 2 = 34

4th term = (3th term) *3 + 3 = 34 * 3 + 3 = 105

5th term = (4th term) * 4 + 4 = 105 * 4 + 4 = 424

6th term = (5th term) * 5 + 5 = 424 * 5 + 5 = 2125

6th term should 2125 instead of 2124.
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