Number Series Quiz: Reasoning Practice
10 timed number series questions. Missing terms, squares and cubes, multiply-and-add patterns and a wrong-number question. With the pattern explained for each.
Number Series Quiz: Reasoning Practice
Tip: use keys 1-4 to answer, Enter for next.
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Number Series All Important Patterns & Approach | Bank Exams 2025 | Career Definer | Kaushik Mohanty (Hindi)Free on YouTube (opens in a new tab)
SSC CGL 2026 | SSC CGL Reasoning Class 2026 | SSC CGL Reasoning Number Series | By Sahil Tiwari Sir (Hindi)Free on YouTube (opens in a new tab)
Examiner's Favourite 25 Patterns of Wrong Number Series | IBPS / SBI PO Prelim 2024 | Aashish Arora (Hindi)Free on YouTube (opens in a new tab)Answers to the starter quiz
Spoilers! These are the Starter quiz’s answers. Easy, Medium, Hard and Mixed rounds show their own answers when you finish.
Find the next number: 2, 6, 12, 20, 30, ?
- 40
- 42
- 44
- 36
Answer: 42. Each term is n × (n + 1): 1×2, 2×3, 3×4, 4×5, 5×6, so next is 6 × 7 = 42.
▶ Watch the explanation (1:50) on YouTube, opens in a new tabFind the next number: 3, 9, 27, 81, ?
- 162
- 216
- 324
- 243
Answer: 243. Each term is multiplied by 3: 81 × 3 = 243.
▶ Watch the explanation (1:50) on YouTube, opens in a new tabFind the next number: 5, 11, 23, 47, ?
- 94
- 93
- 95
- 97
Answer: 95. Each term is ×2 + 1: 47 × 2 + 1 = 95.
▶ Watch the explanation (50:15) on YouTube, opens in a new tabFind the next number: 1, 8, 27, 64, 125, ?
- 196
- 256
- 225
- 216
Answer: 216. These are cubes 1³ to 5³; next is 6³ = 216.
▶ Watch the explanation (32:10) on YouTube, opens in a new tabFind the next number: 7, 10, 16, 25, 37, ?
- 49
- 52
- 51
- 54
Answer: 52. Differences are 3, 6, 9, 12, so the next difference is 15: 37 + 15 = 52.
▶ Watch the explanation (1:50) on YouTube, opens in a new tabFind the next number: 2, 3, 5, 7, 11, 13, ?
- 17
- 15
- 19
- 16
Answer: 17. These are consecutive prime numbers; the prime after 13 is 17.
▶ Watch the explanation (19:35) on YouTube, opens in a new tabFind the wrong number in the series: 4, 9, 19, 39, 79, 160
- 79
- 39
- 19
- 160
Answer: 160. The rule is ×2 + 1: 4, 9, 19, 39, 79, 159. So 160 is wrong; it should be 159.
▶ Watch the explanation on YouTube, opens in a new tabFind the next number: 120, 99, 80, 63, 48, ?
- 36
- 33
- 35
- 37
Answer: 35. Terms are n² − 1 for n = 11, 10, 9, 8, 7; next is 6² − 1 = 35.
▶ Watch the explanation (1:50) on YouTube, opens in a new tabFind the next number: 1, 2, 6, 24, 120, ?
- 720
- 600
- 840
- 620
Answer: 720. Multiply by 2, 3, 4, 5, then 6: 120 × 6 = 720 (these are factorials).
▶ Watch the explanation (50:15) on YouTube, opens in a new tabFind the next number: 6, 7, 11, 20, 36, ?
- 56
- 61
- 52
- 64
Answer: 61. Differences are 1, 4, 9, 16 (squares), so the next difference is 25: 36 + 25 = 61.
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