Number sequence: 6, 7, 11, 20, ____?
- 48
- 52
- 36
- None of these
Explanation
Sequence: 6, 7, 11, 20, ?
Step 1: Find differences
7 − 6 = 1
11 − 7 = 4
20 − 11 = 9
The differences are 1, 4, 9 — which are 1², 2², 3².
Step 2: Next difference = 4² = 16
Step 3: Add to last term
20 + 16 = 36
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