Introduction
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 1 lists important Number series practice questions for competitive exams like RRB ALP/Technical Exams/Junior Engineer Recruitment Exams, SSC, IBPS PO Exams and etc.
Quiz
Q1. 4, 5, 6, 14, ?, 100.5
- A. 32.5
B. 47.5
C. 67.5
D. 37.5
Answer: A
Explanation:
\( 4 \times 1 + 1 \) = 5
\( 5 \times 1.5 – 1.5 \) = 6
\( 6 \times 2 + 2 \) = 14
\( 14 \times 2.5 – 2.5 \) = 32.5
\( 32.5 \times 3 + 3 \) = 100.5
Q2. 8 4 4 8 32 ?
- A. 354
B. 384
C. 294
D. 256
Answer: D
Explanation:
\( 8 \times 0.5 \) = 4
\( 4 \times 1 \) = 4
\( 4 \times 2 \)= 8
\( 8 \times 4 \) = 32
\( 32 \times 8 \)= 256
Q3. 2, 2, 7, ?, 87, 342
- A. 21
B. 26
C. 23
D. 22
Answer: D
Explanation:
2 + 1² – 1 = 2
2 + 2² + 1= 7
7 + 4² – 1= 22
Q4. 6, 8, 8, 22, ?, 151
- A. 43
B. 42
C. 44
D. 47
Answer: D
Explanation:
\( 6 \times 1 + 2 \) = 8
\( 8 \times 1.5 – 4 \) = 8
\( 8 \times 2 + 6 \) = 22
\( 22 \times 2.5 – 8 \) = 47
\( 47 \times 3 + 10 \)= 151
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 …
Q1. 6, 6, 7, ?, 91, 463
- A. 33
B. 43
C. 38
D. 25
Answer: D
Explanation:
\( 6 \times 1 – 1 + 1 \) = 6
\( 6 \times 2 – 2 – 3 \) = 7
\( 7 \times 3 – 1 + 5 \) = 25
Q2. 2, 5, 17, 50, 122, ?
- A. 252
B. 258
C. 257
D. 225
Answer: C
Explanation:
2 + 1³ + 2 = 5
5 + 2³ + 4 = 17
17 + 3³ + 6 = 50
50 + 4³ + 8 = 122
Q3. 2, 9, 39, 161, ?, 2613
- A. 675
B. 670
C. 665
D. 651
Answer: D
Explanation:
\( 2 \times 4 + 1 \) = 9
\( 9 \times 4 + 3 \) = 39
\( 39 \times 4 + 5 \) = 161
\( 161 \times 4 + 7 \) = 651
\( 651 \times 4 + 9 \) = 2613
Q4. 5, ?, 20, 34, 76, 142
- A. 4
B. 5
C. 7
D. 8
Answer: D
Explanation:
\( 5 \times 2 – 2 \) = 8
\( 8 \times 2 + 4 \) = 20
\( 20 \times 2 – 6 \) = 34
Q5. 5, 6, 8, 30, 136, ?
- A. 645
B. 680
C. 650
D. 690
Answer: A
Explanation:
\( 5 \times 1 + 1 \)= 6
\( 6 \times 2 – 2 \)= 10
\( 10 \times 3 + 3 \)= 33
\( 33 \times 4 – 4 \)= 128
\( 128 \times 5 + 5 \)= 645
Q1. 4, 4, 6, 12, 30, ?
- A. 97
B. 92
C. 95
D. 90
Answer: D
Explanation:
\( 4 \times 1 \)= 4
\( 4 \times 1.5 \) = 6
\( 6 \times 2 \) = 12
\( 12 \times 2.5 \) = 30
\( 30 \times 3 \) = 90
Q2. 10, 5, 5, 10, 40, ?
- A. 350
B. 320
C. 360
D. 370
Answer: B
Explanation:
\( 10 \times 0.5 \)= 5
\( 5 \times 1 \) = 5
\( 5 \times 2 \) = 10
\( 10 \times 4 \) = 40
\( 40 \times 8 \) = 320
Q3. 3, 5, ?, 27, 92, 349
- A. 12
B. 18
C. 15
D. 10
Answer: D
Explanation:
3 + 1² + 1 = 5
5 + 2² + 1 = 10
10 + 4² + 1 = 27
Q4. 1, 2, 6, 17, ?, 157.5
- A. 40.5
B. 42.5
C. 49.5
D. 51.5
Answer: C
Explanation:
\( 1 \times 1 + 1 \)= 2
\( 2 \times 1.5 + 3 \) = 6
\( 6 \times 2 + 5 \) = 17
\( 17 \times 2.5 + 7 \) = 49.5
\( 49.5 \times 3 + 9 \)= 157.5
Q5. 7, ?, 19, 45, 95, 177
- A. 8
B. 5
C. 6
D. 9
Answer: D
Explanation:
7 + 1² + 1 = 9
9 + 3² + 1 = 19
19 + 5² + 1 = 45 ….
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