SSC Series Reasoning Set 1 | 25 Most Important Questions 2026

ExamRise — SSC CGL Reasoning: Series

PYQ-pattern practice • Number, Alphabet & Alphanumeric Series

25 Questions20 Minutes+2 / −0.50SSC CGL Level

SSC CGL Reasoning — Series20:00

Question 1Number Series

4, 7, 14, 17, 34, 37, ?

A. 68B. 71C. 74D. 70

Question 2Number Series

5, 10, 17, 26, 37, 50, ?

A. 61B. 63C. 65D. 67

Question 3Number Series

2, 5, 14, 41, ?, 365

A. 122B. 124C. 125D. 126

Question 4Number Series

8, 18, 32, 50, 72, ?

A. 94B. 96C. 98D. 100

Question 5Number Series

3, 8, 15, 24, 35, ?

A. 46B. 48C. 50D. 52

Question 6Number Series

6, 20, 42, 72, 110, ?

A. 145B. 150C. 156D. 164

Question 7Number Series

11, 22, 44, 88, ?, 352

A. 166B. 176C. 182D. 192

Question 8Number Series

81, 64, 49, 36, 25, ?

A. 18B. 16C. 15D. 12

Question 9Number Series

1, 4, 9, 16, ?, 36

A. 20B. 24C. 25D. 30

Question 10Number Series

7, 15, 31, 63, 127, ?

A. 245B. 253C. 255D. 257

Question 11Alphabet Series

A, C, F, J, O, ?

A. TB. UC. VD. W

Question 12Alphabet Series

B, F, J, N, ?

A. RB. QC. SD. T

Question 13Alphabet Series

C, E, G, ?, K, M, ?, Q

A. H,OB. I,OC. I,ND. J,O

Question 14Alphabet Series

Z, W, S, N, H, ?

A. AB. BC. CD. D

Question 15Alphabet Series

D, H, M, S, ?

A. YB. ZC. AD. B

Question 16Alphanumeric Series

A1, C3, E5, G7, ?

A. H8B. I9C. J10D. K11

Question 17Alphanumeric Series

B2, E5, H8, K11, ?

A. M14B. N14C. N15D. O15

Question 18Number Series

12, 30, 56, 90, 132, ?

A. 174B. 176C. 182D. 188

Question 19Number Series

35, 46, 68, 101, 145, ?

A. 190B. 195C. 200D. 205

Question 20Mixed Series

2A, 4C, 6E, 8G, ?

A. 10HB. 10IC. 12ID. 12J

Question 21Number Series

2, 6, 12, 20, 30, ?

A. 40B. 42C. 44D. 46

Question 22Number Series

10, 21, 43, 87, ?

A. 173B. 174C. 175D. 176

Question 23Alphabet Series

AX, BW, CV, DU, ?

A. ETB. FSC. ESD. FT

Question 24Mixed Series

1Z, 3X, 5V, 7T, ?

A. 9RB. 9SC. 10RD. 11Q

Question 25Number Series

8, 32, 72, 128, ?

A. 180B. 192C. 200D. 208

Question Palette

Question-wise Explanation

Q1. +3, ×2 pattern. 37×2=74.
Correct: C. 74

Q2. Gaps are 5,7,9,11,13,15. Answer 65.
Correct: C. 65

Q3. Each term is ×3−1. 41×3−1=122.
Correct: A. 122

Q4. Gaps increase by 4: 10,14,18,22,26. Answer 98.
Correct: C. 98

Q5. Gaps are 5,7,9,11,13. Answer 48.
Correct: B. 48

Q6. Gaps are 14,22,30,38,46. Answer 156.
Correct: C. 156

Q7. Every term is doubled. Answer 176.
Correct: B. 176

Q8. Descending squares: 9²,8²,7²,6²,5²,4².
Correct: B. 16

Q9. Squares of 1 to 6. Answer 25.
Correct: C. 25

Q10. Each term is ×2+1. Answer 255.
Correct: C. 255

Q11. Gaps +2,+3,+4,+5,+6. O+6=U.
Correct: B. U

Q12. Each letter advances by 4. Answer R.
Correct: A. R

Q13. Letters advance by 2. Missing I,O.
Correct: B. I,O

Q14. Backward gaps −3,−4,−5,−6,−7. Answer A.
Correct: A. A

Q15. Gaps +4,+5,+6,+7. S+7=Z.
Correct: B. Z

Q16. Both letter and number increase by 2. Answer I9.
Correct: B. I9

Q17. Both increase by 3. Answer N14.
Correct: B. N14

Q18. Gaps +18,+26,+34,+42,+50. Answer 182.
Correct: C. 182

Q19. Gaps +11,+22,+33,+44,+55. Answer 200.
Correct: C. 200

Q20. Numbers and letters both increase by 2. Answer 10I.
Correct: B. 10I

Q21. n(n+1): next 6×7=42.
Correct: B. 42

Q22. ×2+1 each time. Answer 175.
Correct: C. 175

Q23. First letters +1; second letters −1. Answer ET.
Correct: A. ET

Q24. Numbers +2; letters −2. Answer 9R.
Correct: A. 9R

Q25. 8×1², 8×2², 8×3², 8×4², 8×5² = 200.
Correct: C. 200