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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 (404 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 22% easy, which is gentler than the average topic in this section.

Questions
404
Practice set
25 in 25 min
Difficulty
90/274/40
Negative marking
None
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Number Series questions with solutions

6 from the 404-question pool, worked in full.

  1. 1. Find the next number in the series: 3, 5, 9, 17, 33, ?

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

    Solution. Each term follows the rule (previous term × 2) − 1: 33 × 2 − 1 = 65.

  2. 2. Find the missing number: 6, 8, 12, 20, ?

    • A. 34
    • B. 38
    • C. 36 ✓
    • D. 32

    Solution. The differences double each time (2, 4, 8), so the next difference is 16, giving 20 + 16 = 36.

  3. 3. 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.

  4. 4. Find the next number in the series: 4, 9, 19, 39, ?

    • A. 69
    • B. 74
    • C. 84
    • D. 79 ✓

    Solution. Each term is double the previous term plus 1: 4×2+1=9, 9×2+1=19, 19×2+1=39, 39×2+1=79.

  5. 5. Find the next term: 100, 95, 85, 70, ___.

    • A. 45
    • B. 48
    • C. 50 ✓
    • D. 52

    Solution. The differences increase in magnitude by 5 each time (-5, -10, -15), so the next difference is -20, giving 70 - 20 = 50.

  6. 6. Find the next term: 5, 12, 26, 54, ?

    • A. 108
    • B. 110 ✓
    • C. 112
    • D. 114

    Solution. The differences double each time (7, 14, 28), so the next difference is 56, giving 54 + 56 = 110.

Exams that set Number Series

11 categories, led by Banking, Management, Railways.

    Drawn from AEEE, AFCAT, AILET, ATIT, ATMA, CA Foundation, CLAT, IBPS Clerk, IBPS PO, IBPS RRB Office Assistant, IBPS RRB Officer Scale I, IBPS SO, 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?

    404, from the 50 exams here whose syllabus sets the topic. 22% 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 404 questions are graded hard and 22% easy, making it one of the more tractable topics in this section, against a 17% average.

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