Mental Reasoning 4- 30 Mixed Number Series practice Questions and Step-by-Step Solutions for Competitive Exams SSC, BSSC, Bank, Railways
Mixed Number Series Practice Set
Number Series-Easy Level
1. 2, 4, 6, 8, ?
👉 Difference = +2
Next = 8 + 2 = 10
Answer: 10
(Hindi): प्रत्येक संख्या में 2 जोड़ा गया है → अगला पद 10
2. 3, 6, 9, 12, 15, ?
👉 +3 pattern → 18
Hindi: समान अंतर 3 का है → उत्तर: 18
3. 1, 2, 4, 8, 16, ?
👉 ×2 pattern → 32
Hindi: हर पद पिछले का दोगुना है → उत्तर: 32
4. 10, 20, 30, 40, ?
👉 +10 pattern → 50
5. 1, 4, 9, 16, 25, ?
👉 Squares of 1², 2², 3², 4², 5² → Next = 6² = 36
6. 2, 5, 10, 17, 26, ?
👉 Differences = +3, +5, +7, +9 → Next = +11 → 37
7. 5, 10, 20, 40, ?
👉 ×2 → 80
8. 100, 90, 80, 70, ?
👉 –10 each → 60
9. 1, 1, 2, 3, 5, 8, ?
👉 Fibonacci pattern (sum of last two) → 13
10. 7, 14, 28, 56, ?
👉 ×2 → 112
Number Series-Moderate Level
11. 2, 6, 12, 20, 30, ?
👉 +4, +6, +8, +10 → +12 → 42
Hindi: बढ़ते हुए सम अंतर (+2) → उत्तर: 42
12. 3, 7, 15, 31, 63, ?
👉 ×2 +1 pattern → 127
13. 11, 22, 33, 44, ?
👉 +11 pattern → 55
14. 1, 2, 6, 24, 120, ?
👉 ×1, ×2, ×3, ×4 → Next ×5 → 600
15. 1, 4, 10, 22, 46, ?
👉 ×2 +2 pattern →
1×2+2=4
4×2+2=10
10×2+2=22
22×2+2=46
Next = 46×2+2=94
16. 2, 5, 11, 23, 47, ?
👉 +3, +6, +12, +24 → +48 → 95
17. 3, 9, 27, 81, ?
👉 ×3 → 243
18. 9, 25, 49, 81, ?
👉 3², 5², 7², 9² → Next 11² = 121
19. 2, 3, 5, 8, 12, 17, ?
👉 +1, +2, +3, +4, +5 → 23
20. 10, 20, 41, 83, ?
👉 ×2 +1 → 167
Number Series-High Level
21. 2, 6, 14, 30, 62, ?
👉 ×2 +2 → 2×2+2=6, 6×2+2=14, 14×2+2=30, 30×2+2=62
Next = 62×2+2 = 126
22. 1, 3, 7, 15, 31, 63, ?
👉 ×2 +1 → 127
23. 5, 9, 17, 33, 65, ?
👉 ×2 –1 →
5×2–1=9, 9×2–1=17, 17×2–1=33, 33×2–1=65 →
Next = 65×2–1 = 129
24. 1, 2, 4, 7, 11, 16, ?
👉 Difference = +1, +2, +3, +4, +5 → Next +6 → 22
25. 4, 12, 36, 108, ?
👉 ×3 pattern → 324
26. 8, 16, 32, 64, 128, 255
👉 Pattern ×2 → should be 256, not 255 → Wrong term = 255
27. 1, 4, 9, 16, 23, 25
👉 Pattern = +3, +5, +7, +9 → should be 25 not 23 → Wrong term = 23
28. 2, 5, 10, 17, 26, 37, ?
👉 +3, +5, +7, +9, +11 → 50
29. 4, 9, 19, 39, 79, ?
👉 +5, +10, +20, +40 → +80 → 159
30. 3, 8, 23, 68, 203, ?
👉 ×3 –1 pattern →
3×3–1=8
8×3–1=23
23×3–1=68
68×3–1=203
Next = 203×3–1= 608
Smart Tips for Exams
✅ Always write first and second differences.
✅ If large jumps → check × or ÷ pattern.
✅ Check for alternation (odd-even terms).
✅ Memorize squares (1²–30²) & cubes (1³–20³).
✅ For “wrong term” – test consistency with all pairs.
