Discussion
Home ‣ Aptitude ‣ Odd Man Out and Series Comments
- Question
What is the next number in this series ? 4, 6, 12, 18, 30, 42, 60, ?
Options- A. 71
- B. 72
- C. 73
- D. 69
- Correct Answer
- 72
ExplanationWith close observation, you will note that each number in the list is in the middle of two prime numbers. Thus:
4 is in the middle of 3 and 5, 6 is in the middle of 5 and 7, 12 is in the middle of 11 and 13, 18 is in the middle of 17 and 19, 30 is in the middle of 29 and 31. 42 is in the middle of 41 and 43, 60 is in the middle of 59 and 61.
Therefore, the next number would be the one that is in the middle of the next two prime numbers, which is 72 (which is in the middle of 71 and 73).
- 1. What number should replace the question mark? 125, 138, 164, ?, 255
Options- A. 189
- B. 197
- C. 200
- D. 203 Discuss
- 2. Find the wrong number in the given number series? 5, 8, 40, 90, 664
Options- A. 8
- B. 40
- C. 90
- D. 664 Discuss
- 3. Find the next number in the following number series? 11, 13, 30, 96, ?
Options- A. 264
- B. 392
- C. 412
- D. 459 Discuss
- 4. Find the odd number out of the following number series? 2 4 8 11.5 18.25 28.375
Options- A. 18.25
- B. 28.375
- C. 11.5
- D. 8 Discuss
- 5. Find out the wrong number in the following series: 5, 15, 30, 80, 180, 540, 1080
Options- A. 540
- B. 180
- C. 30
- D. 80 Discuss
- 6. Find the odd one out of the group ?
Options- A. 708
- B. 392
- C. 618
- D. 816 Discuss
- 7. Find the odd one in the given series ? 5-20-25, 10-40-50, 4-15-24, 25-100-125
Options- A. 4-15-24
- B. 5-20-25
- C. 10-40-50
- D. 25-100-125 Discuss
- 8. Find out the wrong term in the following number series. 4, 16, 37, 58, 81.
Options- A. 16
- B. 37
- C. 81
- D. 4 Discuss
- 9. Find the odd one out of the floowing number series? 270, 261, 279, 252, 289, 243
Options- A. 270
- B. 279
- C. 289
- D. 243 Discuss
- 10. Find the wrong number in the given number series? 10, 21, 54, 109, 189
Options- A. 189
- B. 109
- C. 54
- D. 21 Discuss
Odd Man Out and Series problems
Search Results
Correct Answer: 203
Explanation:
The given number series is 125, 138, 164, ?, 255
125
125 + 13x1 = 138
138 + 13x2 = 164
164 + 13x3 = 203
203 + 13x4 = 255
Hence, the missing number in the series is 203.
Correct Answer: 40
Explanation:
The given number series is 5, 8, 40, 90, 664
5
5 - 1 x 2 = 8
8 - 3 x 4 = 20 (NOT 40)
20 - 5 x 6 = 90
90 - 7 x 8 = 664
Correct Answer: 392
Explanation:
The given number series 11, 13, 30, 96, ? follows a pattern that,
11
11 x 1 + 2 = 13
13 x 2 + 4 = 30
30 x 3 + 6 = 96
96 x 4 + 8 = 392
Hence, the next number in the given series is 392.
Correct Answer: 8
Explanation:
Given number series follows a pattern that,
2
2 x 1.5 + 1 = 4
4 x 1.5 + 1 = 7 (not equal to 8)
7 x 1.5 + 1 = 11.5
11.5 x 1.5 + 1 = 18.25
18.25 x 1.5 + 1 = 28.375
Hence, the odd number in the given number series is 8.
Correct Answer: 80
Explanation:
There should be 90 instead of 80
so we can have a series
5, 5x3, 15x2, 30x3, 90x2, 180x3, 540x2 and 1080x3 and so on...
Correct Answer: 392
Explanation:
The sum of the digits in 708, 618 and 816 is 15, but not in 392.
Correct Answer: 4-15-24
Explanation:
In each term second two numbers are multiples of the first number. But in 4-15-24 15 is not multiple of 4.
Correct Answer: 81
Explanation:
The series follows the following pattern.
4
16 =
37 =
58 =
81 .
Here every number is based on the digits of previous number. Hence, 81 is the wrong number in the given series.
Correct Answer: 289
Explanation:
Here the given number series is 270, 261, 279, 252, 289, 243
270 - 9 = 261
261 + 18 = 279
279 - 27 = 252
252 + 36 = 288 (not equals to 289)
288 - 45 = 243
Hence, the odd number in the given number series is 289.
Correct Answer: 189
Explanation:
The given number series is 10, 21, 54, 109, 189
The series follows a pattern that
10 + 11 = 21
21 + 33 = 54
54 + 55 = 109
109 + 77 = 186
Hence the wrong number in the given number series is 189.
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