Multiple choice general knowledge math & puzzles

1, 4, 10, 20, 35, ?, 84

  1. 55

  2. 56

  3. 66

  4. 59

  5. 57
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

First differences: 4-1=3, 10-4=6, 20-10=10, 35-20=15. Second differences: 6-3=3, 10-6=4, 15-10=5. Next second difference is 6, so next first difference is 15+6=21, and missing term is 35+21=56. Checking: 84-56=28, and the pattern continues (21+7=28).

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