Discussion
Home ‣ Aptitude ‣ Odd Man Out and Series Comments
- Question
15, 16, 34, 105, 424, 2124, 12756
Options- A. 16
- B. 34
- C. 105
- D. 424
- E. 2124
- Correct Answer
- 2124
Explanation2nd term = (1st term) x 1 + 1 = 15 x 1 + 1 = 16.3rd term = (2nd term) x 2 + 2 = 16 x 2 + 2 = 34.
4th term = (3th term) x 3 + 3 = 34 x 3 + 3 = 105.
5th term = (4th term) x 4 + 4 = 105 x 4 + 4 = 424
6th term = (5th term) x 5 + 5 = 424 x 5 + 5 = 2125
∴ 6th term should 2125 instead of 2124.
Odd Man Out and Series problems
Search Results
- 1. 64, 71, 80, 91, 104, 119, 135, 155
Options- A. 71
- B. 80
- C. 104
- D. 119
- E. 135 Discuss
Correct Answer: 135
Explanation:
Go on adding 7, 9, 11, 13, 15, 17, 19 respectively to obtain the next number.So, 135 is wrong.
- 2. 3, 7, 15, 39, 63, 127, 255, 511
Options- A. 7
- B. 15
- C. 39
- D. 63
- E. 127 Discuss
Correct Answer: 39
Explanation:
Go on multiplying 2 and adding 1 to get the next number.So, 39 is wrong.
- 3. 40960, 10240, 2560, 640, 200, 40, 10
Options- A. 640
- B. 40
- C. 200
- D. 2560
- E. 10240 Discuss
Correct Answer: 200
Explanation:
Go on dividing by 4 to get the next number.So, 200 is wrong.
- 4. 6, 12, 48, 100, 384, 768, 3072
Options- A. 768
- B. 384
- C. 100
- D. 48
- E. 12 Discuss
Correct Answer: 100
Explanation:
Each even term of the series is obtained by multiplying the previous term by 2.2nd term = (1st term) x 2 = 6 x 2 = 12
4th term = (3rd term) x 2 = 48 x 2 = 96.
6th term = (5th term) x 2 = 384 x 2 =768.
∴ 4th term should be 96 instead of 100.
- 5. 1, 3, 10, 21, 64, 129, 356, 777
Options- A. 10
- B. 21
- C. 64
- D. 129
- E. 356 Discuss
Correct Answer: 356
Explanation:
A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on.So, 356 is wrong.
- 6. 10, 26, 74, 218, 654, 1946, 5834
Options- A. 26
- B. 74
- C. 218
- D. 654
- E. 1946 Discuss
Correct Answer: 654
Explanation:
2nd term = (1st term) x 3 - 4 = 10 x 3 - 4 = 26.3rd term = (2nd term) x 3 - 4 = 26 x 3 - 4 = 74.
4th term = (3th term) x 3 - 4 = 74 x 3 - 4 = 218.
5th term = (4th term) x 3 - 4 = 218 x 3 - 4 = 650.
∴ 5th term must be 650 instead of 654.
- 7. 2880, 480, 92, 24, 8, 4, 4
Options- A. 480
- B. 92
- C. 24
- D. 8
- E. 4 Discuss
Correct Answer: 92
Explanation:
Go on dividing by 6, 5, 4, 3, 2, 1 respectively to obtain the next number.Clearly, 92 is wrong.
- 8. 3, 7, 15, 27, 63, 127, 255
Options- A. 7
- B. 15
- C. 27
- D. 63
- E. 127 Discuss
Correct Answer: 27
Explanation:
Go on multiplying the number by 2 and adding 1 to it to get the next number.So, 27 is wrong.
- 9. The last digit of the number obtained by multiplying the numbers 41 x 42 x 43 x 44 x 45 x 46 x 47 x 48 x 49 will be?
Options- A. 0
- B. 1
- C. 4
- D. 5 Discuss
Correct Answer: 0
Explanation:
Last digit will be multiplication of 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9.
It includes 5 & 2.
So, 5 x 2=10,
0 will be the last digit.- 10. The sum of the digits of a two digit number is 10, when the number is reversed, the number increases by 72.Find the number.
Options- A. 64
- B. 82
- C. 19
- D. 37 Discuss
Correct Answer: 19
Explanation:
By checking options
91-19=72
Or
Let the number be xy
So 10x + y = 10 ..... (i)
When the number is reversed the new number is yx
So (10y + 10 ) - ( 10x +y ) = 72 ....(ii)
From Eqs. (i) & (ii)
x = 1 and y =9
?number = 19
Comments
There are no comments.
More in Aptitude:
Programming
Copyright ©CuriousTab. All rights reserved.