Series — Number, Alphabet & Figural — Practice

Question 1

Find the next term: 4, 9, 19, 34, 54, ?
(a) 74  (b) 79  (c) 84  (d) 89

Accepted Answer

Gaps: 5, 10, 15, 20 → next gap 25.

54 + 25 = 79.

Answer: (b) 79.

Question 2

Find the next term: 2, 5, 10, 17, 26, ?
(a) 35  (b) 36  (c) 37  (d) 39

Accepted Answer

Terms are n² + 1: 2, 5, 10, 17, 26 → 6² + 1 = 37.

(Or gaps 3, 5, 7, 9 → +11.)

Answer: (c) 37.

Question 3

Find the next term: 5, 11, 23, 47, 95, ?
(a) 190  (b) 191  (c) 189  (d) 187

Accepted Answer

Each term = ×2 + 1: 5→11→23→47→95.

95 × 2 + 1 = 191.

Answer: (b) 191.

Question 4

Find the next term: 7, 10, 19, 46, 127, ?
(a) 340  (b) 358  (c) 370  (d) 388

Accepted Answer

Gaps: 3, 9, 27, 81 — powers of 3 → next gap 243.

127 + 243 = 370.

Answer: (c) 370.

Question 5

Find the next term: 3, 100, 6, 93, 11, 86, 18, ?
(a) 77  (b) 79  (c) 81  (d) 83

Accepted Answer

Split tracks. Odd positions: 3, 6, 11, 18 (gaps 3, 5, 7 → n²+2 family). Even positions: 100, 93, 86, ? (−7 each).

86 − 7 = 79.

Answer: (b) 79.

Question 6

Which term is wrong: 3, 6, 11, 18, 28, 38?
(a) 6  (b) 11  (c) 18  (d) 28

Accepted Answer

Gaps: 3, 5, 7, 10, 10 — the odd-number ladder breaks at the fifth term.

Expected gaps 3, 5, 7, 9, 11 give: 3, 6, 11, 18, 27, 38. The final term 38 confirms the rule (27 + 11 = 38 ✓).

So 28 is wrong — it should be 27.

Answer: (d) 28. Referee check passed: the corrected rule lands exactly on the last given term.

Question 7

Find the next term: Z, X, U, Q, L, ?
(a) F  (b) G  (c) E  (d) H

Accepted Answer

Positions: 26, 24, 21, 17, 12 — gaps −2, −3, −4, −5 → next −6.

12 − 6 = 6 = F.

Answer: (a) F.

Question 8

Find the next term: CX, FU, IR, LO, ?
(a) OL  (b) OM  (c) PL  (d) NM

Accepted Answer

First letters: C, F, I, L → +3 → O. Second letters: X, U, R, O → −3 → L.

(Each pair also mirrors: C↔X, F↔U — positions sum 27, confirming.)

Answer: (a) OL.

Question 9

Find the next term: D4, H12, L24, P40, ?
(a) T60  (b) S60  (c) T56  (d) U60

Accepted Answer

Letters: D, H, L, P → +4 → T.

Numbers: 4, 12, 24, 40 — gaps 8, 12, 16 → +20 → 60.

Answer: (a) T60. Two tracks, two rules — always split.

Question 10

Find the next term: 3, 3, 6, 18, 72, ?
(a) 144  (b) 216  (c) 288  (d) 360

Accepted Answer

Multipliers: ×1, ×2, ×3, ×4 → next ×5.

72 × 5 = 360.

Answer: (d) 360.

Practice — Series — Number, Alphabet & Figural

Sign in to save attempts to your dashboard and track your accuracy over time

Find a verified tutor

Join a live course

Browse coaching centres

About

Categories

Support

Documentation

Get Study Tips & Updates

Download Our App

Download for iOS

Download for Android

Popular Cities