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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 (384 of them, from 46 exams, weighted towards Banking, SSC, Management) 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
384
Practice set
25 in 25 min
Difficulty
89/255/40
Negative marking
None
Start Number Series practice

Number Series questions with solutions

6 from the 384-question pool, worked in full.

  1. 1. Find the next number in the series: 3, 7, 15, 31, ?

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

    Solution. Each term is double the previous term plus 1: 3×2+1=7, 7×2+1=15, 15×2+1=31, so the next term is 31×2+1=63.

  2. 2. Find the missing number in the series: 7, 10, 15, 22, 31, ?

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

    Solution. The differences between consecutive terms increase by 2 each time (3, 5, 7, 9, 11): 7+3=10, 10+5=15, 15+7=22, 22+9=31, 31+11=42.

  3. 3. Find the next term: 10, 21, 43, 87, 175, ?

    • A. 349
    • B. 353
    • C. 355
    • D. 351 ✓

    Solution. Each term is double the previous term plus 1: 10×2+1=21, 21×2+1=43, 43×2+1=87, 87×2+1=175, 175×2+1=351.

  4. 4. Find the missing number: 1, 8, 27, 64, ?

    • A. 100
    • B. 110
    • C. 125 ✓
    • D. 130

    Solution. The series is a sequence of perfect cubes: 1³, 2³, 3³, 4³, 5³. The next term is 5³ = 125.

  5. 5. Find the missing number: 250, 245, 235, 220, 200, ?

    • A. 170
    • B. 180
    • C. 185
    • D. 175 ✓

    Solution. The differences increase by 5 each time (−5, −10, −15, −20, −25): 200 − 25 = 175.

  6. 6. Find the missing number in the series: 4, 10, 22, 46, 94, ?

    • A. 186
    • B. 188
    • C. 190 ✓
    • D. 192

    Solution. Each term is double the previous term plus 2: 4×2+2=10, 10×2+2=22, 22×2+2=46, 46×2+2=94, 94×2+2=190.

Exams that set Number Series

10 categories, led by Banking, SSC, Management.

    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, LIC AAO, MAT, 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 Selection Post, SSC Stenographer, TANCET MBA, Territorial Army, UPSC CSE.

    Number Series: frequently asked questions

    How many number series questions are there?

    384, from the 46 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 18% average.

    Which exams ask number series questions?

    46 of the exams on this site, weighted towards Banking (13), SSC (8), Management (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 384 questions are graded hard and 23% easy, making it one of the more tractable topics in this section, against a 18% average.

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