number series Questions and Answers
Practice Number Series questions for logical reasoning competitive exams like SSC Banking Railway and UPSC
FAQ
Number Series FAQs
Common questions and clear answers for this topic.
What is Number Series in logical reasoning and what types are asked in exams?
Number Series questions present a sequence of numbers following a specific pattern, and the candidate must identify the pattern to find the missing or wrong number. Common types: Arithmetic series (constant difference), Geometric series (constant ratio), Square/cube series, Prime number series, Fibonacci series, and Alternating series. Number Series is frequently asked in SSC CGL, IBPS Bank PO, RRB NTPC, and SBI Clerk exams.
What is an Arithmetic Progression and how to identify it in number series?
An Arithmetic Progression (AP) is a number series where the difference between consecutive terms is constant (common difference d). Example: 2, 5, 8, 11, 14 (d=3) or 20, 16, 12, 8 (d=-4). Formula: nth term = a + (n-1)d where a is first term. To identify AP, subtract consecutive terms - if the difference is constant, it is an AP. These are the easiest number series questions in competitive exams.
What is a Geometric Series and how to solve it?
A Geometric Series is a number series where each term is obtained by multiplying the previous term by a constant ratio (r). Example: 2, 6, 18, 54, 162 (r=3) or 256, 128, 64, 32, 16 (r=0.5). Formula: nth term = a times r^(n-1). To identify geometric series, divide each term by the previous term - if the ratio is constant, it is geometric. Square and cube series are variations involving perfect squares or cubes.
How to solve Wrong Number Series questions in bank exams?
Wrong Number Series questions give a sequence with one incorrect number. Strategy: 1) Look at each number relative to others, 2) Try to identify the pattern (AP, GP, squares, cubes, mixed operations), 3) Find which number breaks the pattern, 4) That is the wrong number. Practice multiple series patterns for accuracy. These questions appear in IBPS PO, SBI PO, and RBI Grade B exams.
What are the important tips and tricks to solve Number Series quickly?
Quick tips for Number Series: 1) Check differences first (AP pattern), 2) If differences increase, check second differences (quadratic), 3) Check ratios for geometric series, 4) Look for squares (1,4,9,16,25), cubes (1,8,27,64,125), primes (2,3,5,7,11,13), 5) Check alternate terms separately in mixed series, 6) For two-step series check if times n plus or minus constant, 7) Practice 20-30 questions daily.
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