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Multiple Choice Questions (MCQs) on Series Completion is a fundamental topic in logical reasoning and aptitude tests. It evaluates your ability to identify patterns and predict the next element in a sequence of numbers, letters, or symbols. MCQ on Series Completion are asked in competitive exams like Bank PO/Clerk, SBI PO, SBI Clerk, IBPS PO, IBPS Clerk, IBPS RRB, RBI, SSC, SSC CGL, SSC CHSL, SSC MTS, SSC GD, RRB NTPC, RRB Group D, AFCAT, CDS, CLAT, CAPF and NDA.

Series Completion
Series Completion Reasoning: Series completion is a Verbal Reasoning question requiring you to identify the pattern in a sequence of numbers, letters, or symbols and complete the series by filling in the missing terms. Questions in which a series of numbers or alphabetical letters is given are called terms of the series. These terms follow a certain pattern. You must recognize this pattern and complete the given series with the most suitable alternative or find the wrong term.

  1. In series 2, 6, 18, 54, …… what will be the 8th term?
    a) 4370 b) 4374 c) 7443 d) 7434

Correct Answer: b) 4374
Each term is obtained by multiplying the previous term by 3. So, to find the 8th term, we continue this pattern: 54 * 3 = 162, 162 * 3 = 486, 486 * 3 = 1458, 1458 * 3 = 4374.
  1. What is the missing number in the series:
    3, 8, 15, _?_ , 35
    a) 18 b) 22 c) 24 d) 28

Correct Answer: c) 24
Explanation: The series adds consecutive prime numbers starting from 2: 3 (2+1), 8 (3+5), 15 (5+10), 24 (7+17), 35 (11+24).
  1. What comes next in the series:
    3, 6, 18, 72, …?
    a) 216 b) 324 c) 432 d) 648

Correct Answer: d) 648
This series represents a pattern where each number is multiplied by 2, and then the result is multiplied by 3. So, to find the next term, we take 72 * 2 * 3 = 432 * 3 = 1296, and so on, making the next term 1296 * 2 * 3 = 648.
  1. What will come in (?) in the following series?
    132 , 156, 182, 210, 240, ?

A. 272 B. 284 C. 296 D. 302 E. None of these


Correct Answer: A
Series Pattern
11 × 12 = 132
12 × 13 = 156
13 × 14 = 182
14 × 15 = 210
15 × 16 = 240
16 × 17 = 272
Hence, option (A) is correct.
  1. What will come in (?) in the following series?
    12, 6, 15, 67.5, ? ,3729.375

A. 583.75 B. 589.75 C. 498.75 D. 438.75 E. 555.75


Correct Answer: D
Series Pattern Given Series
12 12
12 × 0.5 = 6 6
6 × 2.5 = 15 15
15 × 4.5 = 67.5 67.5
67.5 × 6.5 = 438.75 438.75
438.75 × 8.5 = 6024.375 3729.375
  1. Choose the correct alternative that will continue the same pattern and replace the question mark in the given series
    3, 9, 33, 129, 513, ?

A. 2052 B. 1951 C. 2049 D. 1849 E. 1026


Correct Answer: C
Series Pattern Given Series
3 3
3 × 4 – 3 = 9 9
9 × 4 – 3 = 33 33
33 × 4 – 3 = 129 129
129 × 4 – 3 = 513 513
513 × 4 – 3 = 2049 2049

Hence, option (C) is correct.

  1. Choose the correct alternative to continue the same pattern and replace the question mark in the given series.
    1, 1, 2, 6, 24, ?, 720

A. 100 B. 104 C. 108 D. 120


Correct Answer: D
The pattern is x 1, x 2, x 3, x 4,…..
So, missing term = 24 x 5 = 120.
  1. Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
    4832, 5840, 6848, ?

A. 7815 B. 7846 C. 7856 D. 7887


Correct Answer: C
The pattern is + 1008.
So, missing term: 6848 + 1008 = 7856.
  1. Replace the question mark in the given series
    5824, 5242, ?, 4247, 3823

A. 4467 B. 4718 C. 4856 D.5164


Correct Answer: B

Each term in the series is obtained by subtracting from the preceding term the number
formed by the first three digits of the preceding term.
So, missing term = 5242 – 524 = 4718.

  1. Choose the correct alternative that will continue the same pattern and replace the question mark in the given series. 45, 54, 47, ?, 49, 56, 51, 57, 53

A. 48 B. 50 C. 55 D. None of these


Correct Answer: C
The given sequence is a combination of two series:

I. 45, 47, 49, 51, 53 and II. 54, ?, 56, 57

Clearly,
II consists of consecutive natural numbers, starting from 54.
So, missing term = 55.

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