1, 3, 6, 10, 15, ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 21.
Given series: 1, 3, 6, 10, 15, ?
1 + 2 = 3, 3 + 3 = 6, 6 + 4 = 10, 10 + 5 = 15, 15 + 6 = 21
SSC CGL - 23 Sep 2025 - Shift 2 • Reasoning • Q77
1, 3, 6, 10, 15, ?
Correct answer: B
Explanation
The correct answer is option 2 i.e. 21.
Given series: 1, 3, 6, 10, 15, ?
1 + 2 = 3, 3 + 3 = 6, 6 + 4 = 10, 10 + 5 = 15, 15 + 6 = 21