91.
4, 8, 16, 32, 64… 256
Answer: A
Correct answer: 128
Each term is double the one before, so between 64 and 256 stands \( 64 \times 2 = \mathbf{128} \).
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Series Completion Questions and Answers
Important Instructions
Direction for [ Question No: 91 To 95 ] :
In each of the following questions, a number series is given with one term missing. Choose the correct alternative that will continue the same pattern.
92.
5, 20, 80, 320, … 1280
Answer: A
Correct answer: 5120
Each term is four times the one before: \( 5, 20, 80, 320, 1280 \), so the term after 1280 is \[ 1280 \times 4 = \mathbf{5120} \]
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93.
3,6,9,12,15,…. 21
Answer: D
Correct answer: 18
The series rises by 3 each time, so between 15 and 21 stands \( 15 + 3 = \mathbf{18} \).
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94.
55, 50, 45, 40,….30
Answer: C
Correct answer: 35
The series falls by 5 each time, so between 40 and 30 stands \( 40 - 5 = \mathbf{35} \).
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95.
16, 24, 36,… 81
Answer: B
Correct answer: 54
Each term is one and a half times the one before: \( 16 \times \tfrac32 = 24 \), \( 24 \times \tfrac32 = 36 \), so \[ 36 \times \tfrac32 = \mathbf{54} \] and \( 54 \times \tfrac32 = 81 \), as shown.
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96.
3, 4, 7, 7, 13, 13, 21, 22, 31, 34, ?
Answer: B
The given sequence is a combination of two series :
I. 3, 7, 13, 21, 31, ? and II. 4, 7, 13, 22, 34
The pattern in I is + 4, + 6, + 8, + 10,.....
The pattern in II is + 3, + 6, + 9, + 12,.....
So, missing term = 31 + 12 = 43.
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97.
5040, 720, 120, 24, ….2,1
Answer: C
Correct answer: 6
The terms are the factorials counting downwards: \( 7! = 5040 \), \( 6! = 720 \), \( 5! = 120 \), \( 4! = 24 \), so the next is \( 3! = \mathbf{6} \), followed by \( 2! = 2 \) and \( 1! = 1 \).
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98.
4, 16, 36, 64, …. 144
Answer: C
Correct answer: 100
The terms are the squares of the even numbers: \( 2^2=4 \), \( 4^2=16 \), \( 6^2=36 \), \( 8^2=64 \), so the next is \( 10^2 = \mathbf{100} \), followed by \( 12^2 = 144 \).
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99.
1, 4, 9, 16, 25, 36, 49, … 81
Answer: C
Correct answer: 64
The terms are the squares in order, \( 1^2 \) to \( 7^2 \), so the next is \( 8^2 = \mathbf{64} \), followed by \( 9^2 = 81 \).
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100.
17, 26, 37, 50, 65,….101
Answer: A
Correct answer: 82
Each term is one more than a square: \( 4^2+1=17 \), \( 5^2+1=26 \), \( 6^2+1=37 \), \( 7^2+1=50 \), \( 8^2+1=65 \), so the next is \( 9^2+1 = \mathbf{82} \), followed by \( 10^2+1 = 101 \).
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Topics
- Analogy
- Number Series
- Classification
- Series Completion
- Coding-Decoding
- Input Output
- Inequality
- Blood Relation
- Puzzle Test
- Sequential Output Tracing
- Direction Sense Test
- Linear Seating Arrangement
- Circular Seating Arrangement
- Logical Venn Diagrams
- Alphabet Test
- Number, Ranking and Time Sequence Test
- Mathematical Operations
- Logical Sequence of Words
- Arithmetical Reasoning
- Inserting The Missing Character
- Data Sufficiency
- Decision Making
- Assertion and Reason
- Situation Reaction Test
- Letter and Symbol Series
- Verification of Truth of the Statement
- Logic
- Statement - Arguments
- Statement - Assumptions
- Statement - Courses of Action
- Syllogisms
- Statement - Conclusions
- Deriving Conclusions From Passages
- Theme Detection
- Question - Statements
- Miscellaneous Logical Puzzles
- Mirror and Water Images
- Paper Folding and Cutting
- Completion of Incomplete Pattern