Question 1

What is the verified answer to “Solve this Number Series question: Find the next number in the series: 5, 10, 20, 40, 80, ?”?

Accepted Answer

160, option C.

Question 2

Which method solves this Number Series item?

Accepted Answer

Rebuild and verify the complete number pattern.

Question 3

Why are the other options incorrect?

Accepted Answer

169, 154, 161 break a clue, direction, transition or operation.

Question 4

How should the answer be checked?

Accepted Answer

Replay the rule from the first clue or term and test every intermediate step.

Question 5

What is Number Series in logical reasoning and what types are asked in exams?

Accepted Answer

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.

Question 6

What is an Arithmetic Progression and how to identify it in number series?

Accepted Answer

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.

Question 7

What is a Geometric Series and how to solve it?

Accepted Answer

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.

Question 8

How to solve Wrong Number Series questions in bank exams?

Accepted Answer

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.

Question 9

What are the important tips and tricks to solve Number Series quickly?

Accepted Answer

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.

Solve this Number Series question: Find the next number in the series: 5, 10, 20, 40, 80, ?

Explanation

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