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Reasoning practice

Number Series Questions with Answers

Finding the rule behind a sequence, then the missing or wrong term it implies. This page pools every number series question on the site (400 of them, from 50 exams, weighted towards Banking, Management, Railways) so you can drill the topic on its own instead of meeting four of them inside a full paper.

10% of the pool is graded hard on this site’s own scale and 23% easy, which is gentler than the average topic in this section.

Questions
400
Practice set
25 in 25 min
Difficulty
90/270/40
Negative marking
None
Start Number Series practice

Number Series questions with solutions

6 from the 400-question pool, worked in full.

  1. 1. Find the next number in the series: 5, 9, 14, 20, 27, ?

    • A. 35 ✓
    • B. 33
    • C. 37
    • D. 39

    Solution. The differences increase by 1 each time (+4, +5, +6, +7, +8): 27 + 8 = 35.

  2. 2. Find the next term: 7, 15, 31, 63, ?

    • A. 127 ✓
    • B. 120
    • C. 125
    • D. 130

    Solution. Each term follows the rule ×2+1: 63 × 2 + 1 = 127.

  3. 3. Find the next number in the series: 900, 450, 225, 112.5, ?

    • A. 56.25 ✓
    • B. 54
    • C. 55
    • D. 57

    Solution. Each term is divided by 2: 112.5 ÷ 2 = 56.25.

  4. 4. Find the next number in the series: 8, 19, 41, 85, ?

    • A. 173 ✓
    • B. 169
    • C. 171
    • D. 175

    Solution. Each term is double the previous term plus 3: 85 × 2 + 3 = 173.

  5. 5. Find the next term: 1, 8, 27, 64, 125, ?

    • A. 196
    • B. 206
    • C. 216 ✓
    • D. 226

    Solution. The series consists of perfect cubes (1³, 2³, 3³, 4³, 5³). The next term is 6³=216.

  6. 6. One number in the series below does not fit the pattern. Find that number: 3, 9, 27, 84, 243

    • A. 27
    • B. 9
    • C. 84 ✓
    • D. 243

    Solution. Each term should be 3 times the previous term: 3→9→27→81→243. The given series shows 84 instead of the expected 81, making 84 the number that does not fit.

Exams that set Number Series

11 categories, led by Banking, Management, Railways.

Also set by INET, KMAT Karnataka, KVS PRT, LIC AAO, MAT, MH CET Law, MH CET Law (3-Year LLB), MICAT, NABARD Grade A, NIACL AO, NIFT, NMAT, RBI Assistant, RPF Constable, RPF Sub-Inspector, RRB ALP, RRB Group D, RRB Junior Engineer, RRB Paramedical, RRB Technician, SBI Clerk, SBI PO, SEBI Grade A, SIDBI Grade A & B, SNAP, SRMJEEE, SSC CGL, SSC CHSL, SSC CPO, SSC GD Constable, SSC Junior Engineer, SSC MTS, SSC Stenographer, TANCET MBA, Territorial Army, UKPSC PCS, UPPSC PCS, UPSC CSE. Browse all exams.

Number Series: frequently asked questions

How many number series questions are there?

400, from the 50 exams here whose syllabus sets the topic. 23% are graded easy and 10% hard, which makes number series one of the more tractable topics in this section, against a 17% average.

Which exams ask number series questions?

50 of the exams on this site, weighted towards Banking (13), Management (7), Railways (7). Every question in this pool comes from one of their own mock tests, so the list below is the honest answer to whether the topic is worth your time.

Is number series hard?

10% of these 400 questions are graded hard and 23% easy, making it one of the more tractable topics in this section, against a 17% average.

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