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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 — 383 of them, from 45 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
383
Practice set
25 in 25 min
Difficulty
89/255/39
Negative marking
None
Start Number Series practice

Number Series questions with solutions

6 from the 383-question pool, worked in full.

  1. 1. Find the next term: 2, 6, 12, 20, 30, ___.

    • A. 42 ✓
    • B. 40
    • C. 44
    • D. 48

    Solution. The differences are 4, 6, 8 and 10; the next difference is 12, giving 42.

  2. 2. Find the next number in the series: 7, 15, 31, 63, 127, ?

    • A. 251
    • B. 257
    • C. 253
    • D. 255 ✓

    Solution. Each term is double the previous term plus 1: 7×2+1=15, 15×2+1=31, 31×2+1=63, 63×2+1=127, 127×2+1=255.

  3. 3. Find the next term: 7, 15, 26, 40, 57, ?

    • A. 77 ✓
    • B. 75
    • C. 79
    • D. 81

    Solution. The differences are 8, 11, 14, 17, each increasing by 3, so the next difference is 20: 57 + 20 = 77.

  4. 4. Find the missing number: 90, 85, 77, 66, 52, ?

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

    Solution. The differences increase by 3 each time (−5, −8, −11, −14, −17): 52 − 17 = 35.

  5. 5. Find the missing number: 3, 9, 27, 81, ?

    • A. 162
    • B. 216
    • C. 243 ✓
    • D. 324

    Solution. Each term is 3 times the previous term: 3, 9, 27, 81, 243.

  6. 6. Find the next number in the series: 200, 180, 155, 125, 90, ?

    • A. 45
    • B. 50 ✓
    • C. 55
    • D. 60

    Solution. The differences increase by 5 each time (−20, −25, −30, −35, −40): 90 − 40 = 50.

Exams that set Number Series

10 categories, led by Banking, SSC, Management.

Also set by 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, 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. Browse all exams.

Number Series: frequently asked questions

How many number series questions are there?

383, from the 45 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?

45 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 383 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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