Mental Reasoning 1- Series: Practice Set of 30 Questions with Step-by-Step Solutions as in Competitive Exams SSC, BSSC, Bank, Railways

Mental Reasoning 1- Series: Practice Set of 30 Questions with Step-by-Step Solutions as in Competitive Exams SSC, BSSC, Bank, Railways

Part A: Number Series (संख्या श्रृंखला)

Q1. 2, 4, 8, 16, ?

Step: Each term ×2
Next term = 32
Answer: 32
Explanation (Hindi): हर संख्या पिछली संख्या का दुगना है।

Q2. 5, 10, 20, 40, ?, 160

Step: Multiply by 2 each time.
Missing term = 80
Explanation (Hindi): प्रत्येक संख्या ×2 हो रही है, इसलिए अगली संख्या 80 होगी।

Q3. 1, 4, 9, 16, 25, ?

Step: These are perfect squares.
Next term = 36 (6²)
Explanation (Hindi): सभी वर्ग संख्या हैं।

Q4. 3, 6, 12, 24, 48, ?

Step: ×2 pattern.
Next = 96
Explanation (Hindi): हर संख्या पिछली का दोगुना है।

Q5. 2, 6, 12, 20, 30,?

Step: Difference = +4, +6, +8, +10 → next +12
Next = 42
Explanation (Hindi): अंतर क्रमशः बढ़ रहा है।

Q6. 1, 3, 6, 10, 15, ?

Step: Differences = +2, +3, +4, +5 → next +6
Next = 21
Explanation (Hindi): यह त्रिभुज संख्याओं की श्रृंखला है।

Q7. 7, 14, 28, 56,?

Step: ×2 pattern.
Next = 112
Explanation (Hindi): हर बार दोगुना।

Q8. 2, 3, 5, 8, 12, 17, ?

Step: Differences = +1, +2, +3, +4, +5 → next +6
Next = 23
Explanation (Hindi): बढ़ते हुए अंतर से श्रृंखला बनी है।

Q9. 2, 6, 18, 54,?

Step: ×3 pattern.
Next = 162
Explanation (Hindi): प्रत्येक पद ×3 किया गया है।

Q10. 1, 2, 6, 24, 120, ?

Step: ×1, ×2, ×3, ×4, ×5 → next ×6
Next = 720
Explanation (Hindi): यह factorial श्रृंखला है।

Part B: Alphabet Series (वर्णमाला श्रृंखला)

Q11. A, C, E, G, ?

Step: +2 letters
Next = I
Explanation (Hindi): हर बार दो अक्षर छोड़कर।

Q12. Z, X, V, T, ?

Step: -2 letters
Next = R
Explanation (Hindi): उलटी दिशा में दो अक्षर कम।

Q13. A, D, H, M, ?

Step: +3, +4, +5 → next +6
Next = S
Explanation (Hindi): बढ़ते हुए अंतर से अक्षर आगे बढ़ते हैं।

Q14. A, Z, B, Y, C, X, ?

Step: Two alternate sequences – A, B, C… and Z, Y, X…
Next = D, W
Explanation (Hindi): अक्षर क्रम दो दिशाओं में चल रहे हैं।

Q15. B, E, H, K, N,?

Step: +3 each time
Next = Q
Explanation (Hindi): हर बार तीन अक्षर छोड़े जा रहे हैं।

Part C: Alphanumeric Series (अक्षरसंख्या मिश्रित श्रृंखला)

Q16. A1, B2, C3, D4, ?

Step: Letter +1, Number +1
Next = E5

Q17. A2, C4, E6, G8, ?

Step: Letters +2, Numbers +2
Next = I10

Q18. 1A, 2B, 4C, 8D, ?

Step: Numbers ×2, Letters +1
Next = 16E

Q19. B1, D4, F9, H16, ?

Step: Letters +2, Numbers are squares (1,4,9,16,25)
Next = J25

Q20. Z9, Y8, X7, W6, ?

Step: Letters -1, Numbers -1
Next = V5

Part D: Mixed Series (Symbols + Letters + Numbers)

Q21. A1$, B2%, C3&, D4#, ?

Pattern: Letters +1, Numbers +1, Symbols alternate
Next = E5@

Q22. Z9#, X8$, V7%, ?

Step: Letters -2, Numbers -1
Next = T6^

Q23. 1A*, 3C*, 5E*, ?

Step: Numbers +2, Letters +2
Next = 7G*

Q24. A2$, C4#, E6%, G8&, ?

Step: +2 in both letters & numbers
Next = I10*

Q25. 2B@, 4D#, 6F$, 8H%, ?

Step: Numbers +2, Letters +2, Symbols alternate
Next = 10J@

Part E: Logical / Figurative Series (Verbal Description)

Q26. Square → Pentagon → Hexagon →?

Step: Increasing sides +1
Next = Heptagon (7 sides)

Q27. Arrow: ↑ → ↓ →?

Step: Rotates 90° clockwise
Next = ←

Q28. Figure with 1 dot → 2 dots → 3 dots →?

Next = 4 dots

Q29. Triangle shaded left → right → top →?

Next = Bottom shaded

Q30. Circle → Half Circle → Quarter Circle →?

Next = One-eighth Circle (1/8)

Summary / Quick Trick Table

TypeKey ClueTypical Pattern
Number SeriesDifferences or ratios+, ×, squares
Alphabet SeriesPosition jumps+n / -n
AlphanumericCombinedLetter + Number logic
MixedInclude symbolsAll 3 vary
LogicalShapes/directionsRotation, addition, flip

To master it, practice regularly.

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