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Quantitative Aptitude - SPLessons
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Number Series Practice Set 2

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Number Series Practice Set 2

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Number Series is one of the important topic in the Quantitative Aptitude section. Number Series is the arrangement of numbers in a certain order where some numbers are wrongly kept or some numbers are missing from that series. So accurate series are to be found. Number Series in competitive exams are divided into two. One is missing series and the other is the wrong series. A number series is given in which a number is wrongly placed in the wrong series. Candidates are asked to identify that particular wrong number. A number series in which a specific number is missing is the missing series. Candidates have to identify the missing number. The article Number Series Practice Set 2 lists important Number series practice questions for competitive exams like RRB ALP/Technical Exams/Junior Engineer Recruitment Exams, SSC, IBPS PO Exams and etc.

shape Quiz

Q1. 9, 8, 15, ?, 175, 874
    A. 42 B. 24 C. 38 D. 44
Answer: D
Explanation: [latex] 9 \times 1 – 1 [/latex] = 8
[latex] 8 \times 2 – 1 [/latex] = 15
[latex] 15 \times 3 – 1 [/latex] = 44
Q2. 2, 2, 12, 36, 104, ?
    A. 232 B. 221 C. 223 D. 224
Answer: D
Explanation: 2 + 1³ – 1 = 2
2 + 2³ + 2 = 12
12 + 3³ – 3 = 36
36 + 4³ + 4 = 104
Q3. 4, 15, 63, 247, 995, ?
    A. 3975 B. 3973 C. 3965 D. 3971
Answer: D
Explanation: [latex] 4 \times 4 – 1 [/latex] = 15
[latex] 15 \times 4 + 3 [/latex] = 63
[latex] 63 \times 4 – 5 [/latex] = 247
[latex] 247 \times 4 + 7 [/latex] = 995
[latex] 995 \times 4 – 9 [/latex] = 3971
Q4. 3, ?, 7, 9, 11, 13
    A. 6 B. 5 C. 8 D. 9
Answer: D
Explanation: [latex] 3 \times 2 – 1 [/latex] = 5
[latex] 5 \times 2 – 3 [/latex] = 7
[latex] 7 \times 2 – 5 [/latex] = 9
Q5. 6, 8, 12, 42, 160, ?
    A. 870 B. 840 C. 850 D. 810
Answer: D
Explanation: [latex] 6 \times 1 + 2 [/latex] = 8
[latex] 8 \times 2 – 4 [/latex]= 12
[latex] 12 \times 3 + 6 [/latex] = 42
[latex] 42 \times 4 – 8 [/latex] = 160
[latex] 160 \times 5 + 10 [/latex] = 810
Q1. 8, 9, 15, 32, ?, 250.5
    A. 82.5 B. 47.5 C. 62.5 D. 37.5
Answer: A
Explanation: [latex] 8 \times 1 + 1 [/latex] = 9
[latex] 9 \times 1.5 + 1.5[/latex] = 15
[latex] 15 \times 2 + 2 [/latex] = 32
[latex] 32 \times 2.5 + 2.5 [/latex] = 82.5
[latex] 82.5 \times 3 + 3 [/latex] = 250.5
Q2. 12 7 9 22 96 ?
    A. 754 B. 784 C. 794 D. 734
Answer: B
Explanation: [latex] 12 \times 0.5 + 1 [/latex] = 7
[latex] 7 \times 1 + 2 [/latex] = 9
[latex] 9 \times 2 + 4 [/latex] = 22
[latex] 22 \times 4 + 8 [/latex] = 96
[latex] 96 \times 8 + 16 [/latex] = 784
Q3. 2, 4, 7, ?, 87, 344
    A. 38 B. 24 C. 56 D. 44
Answer: B
Explanation: 2 + 1² + 1 = 4
4 + 2² – 1 = 7
7 + 4² + 1 = 24
24 + 8² – 1 = 87
87 + 16² + 1 = 344
Q4. 6, 4, 10, 14, 43, ?
    A. 119 B. 127 C. 114 D. 141
Answer: A
Explanation: [latex] 6 \times 1 – 2 [/latex] = 4
[latex] 4 \times 1.5 + 4 [/latex] = 10
[latex] 10 \times 2 – 6 [/latex] = 14
[latex] 14 \times 2.5 + 8 [/latex] = 43
[latex] 43 \times 3 – 10 [/latex] = 119
Q5. 4, ?, 14, 40, 88, 170
    A. 9 B. 5 C. 6 D. 7
Answer: C
Explanation: 4 + 1² + 1 = 6
6 + 3² – 1 = 14
14 + 5² + 1 = 40
40 + 7² – 1 = 88
88 + 9² + 1 = 170
Q1. 6, 6, 7, ?, 91, 463
    A. 33 B. 43 C. 38 D. 25
Answer: D
Explanation: [latex] 6 \times 1 – 1 + 1 [/latex] = 6
[latex] 6 \times 2 – 2 – 3 [/latex] = 7
[latex] 7 \times 3 – 1 + 5 [/latex] = 25
[latex] 25 \times 4 – 2 – 7 [/latex] = 91
[latex] 91 \times 5 – 1 + 9 [/latex] = 463
Q2. 2, 5, 9, 42, 98, ?
    A. 233 B. 218 C. 221 D. 225
Answer: A
Explanation: 2 + 1³ + 2 = 5
5 + 2³ – 4 = 9
9 + 3³ + 6 = 42
42 + 4³ – 8 = 98
98 + 5³ + 10 = 233
Q3. 3, 11, 47, 183, ?, 2947
    A. 775 B. 770 C. 765 D. 739
Answer: D
Explanation: [latex] 3 \times 4 – 1 [/latex] = 11
[latex] 11 \times 4 + 3 [/latex] = 47
[latex] 47 \times 4 – 5 [/latex] = 183
[latex] 183 \times 4 + 7 [/latex] = 739
[latex] 739 \times 4 – 9 [/latex] = 2947
Q4. 2, ?, 8, 10, 28, 46
    A. 2 B. 5 C. 4 D. 8
Answer: C
Explanation: [latex] 2 \times 2 – 2 [/latex] = 2
[latex] 2 \times 2 + 4 [/latex] = 8
[latex] 8 \times 2 – 6 [/latex] = 10
[latex] 10 \times 2 + 8 [/latex] = 28
[latex] 28 \times 2 – 10 [/latex] = 46
Q5. 4, 6, 8, 30, 112, ?
    A. 540 B. 580 C. 590 D. 570
Answer: D
Explanation: [latex] 4 \times 1 + 2 [/latex] = 6
[latex] 6 \times 2 – 4 [/latex] = 8
[latex] 8 \times 3 + 6 [/latex] = 30
[latex] 30 \times 4 – 8 [/latex] = 112
[latex] 112 \times 5 + 10 [/latex] = 570

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