InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
1, 4, 9, 16, 23, 25, 36 |
| Answer» Each of the numbers except 23, is perfect square. | |
| 2. |
10, 14, 16, 18, 21, 24, 26 |
| Answer» Each of the numbers except 21 is an even number. | |
| 3. |
835, 734, 642, 751, 853, 981, 532 |
| Answer» In each number except 751, the difference of third and first digit is the middle one. | |
| 4. |
1, 2, 6, 15, 31, 56, 91 |
| Answer» 1, 1 + 12 = 2, 2 + 22 = 6, 6 + 32 = 15, 15 + 42 = 31, 31 + 52 = 56, 56 + 62 = 92 Last number of given series must be 92 not 91. | |
| 5. |
7, 26, 63, 124, 215, 342, (....) |
| Answer» Numbers are (23 - 1), (33 - 1), (43 - 1), (53 - 1), (63 - 1), (73 - 1) etc. So, the next number is (83 - 1) = (512 - 1) = 511. | |
| 6. |
3, 5, 7, 12, 17, 19 |
| Answer» Each of the numbers is a prime number except 12. | |
| 7. |
6, 13, 18, 25, 30, 37, 40 |
| Answer» The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong. | |
| 8. |
3, 7, 15, 39, 63, 127, 255, 511 |
| Answer» Go on multiplying 2 and adding 1 to get the next number. So, 39 is wrong. | |
| 9. |
331, 482, 551, 263, 383, 362, 284 |
| Answer» In each number except 383, the product of first and third digits is the middle one. | |
| 10. |
3, 5, 11, 14, 17, 21 |
| Answer» Each of the numbers except 14 is an odd number. The number '14' is the only EVEN number. | |
| 11. |
8, 27, 64, 100, 125, 216, 343 |
| Answer» The pattern is 23, 33, 43, 53, 63, 73. But, 100 is not a perfect cube. | |
| 12. |
10, 25, 45, 54, 60, 75, 80 |
| Answer» Each of the numbers except 54 is multiple of 5. | |
| 13. |
396, 462, 572, 427, 671, 264 |
| Answer» In each number except 427, the middle digit is the sum of other two. | |
| 14. |
6, 9, 15, 21, 24, 28, 30 |
| Answer» Each of the numbers except 28, is a multiple of 3. | |
| 15. |
1, 4, 9, 16, 20, 36, 49 |
| Answer» The pattern is 12, 22, 32, 42, 52, 62, 72. But, instead of 52, it is 20 which to be turned out. | |
| 16. |
2, 5, 10, 17, 26, 37, 50, 64 |
| Answer» (1*1)+1 , (2*2)+1 , (3*3)+1 , (4*4)+1 , (5*5)+1 , (6*6)+1 , (7*7)+1 , (8*8)+1 But, 64 is out of pattern. | |
| 17. |
16, 25, 36, 72, 144, 196, 225 |
| Answer» Each of the numbers except 72 is a perfect square. | |
| 18. |
41, 43, 47, 53, 61, 71, 73, 81 |
| Answer» Each of the numbers except 81 is a prime number. | |
| 19. |
582, 605, 588, 611, 634, 617, 600 |
| Answer» Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong. | |
| 20. |
8, 13, 21, 32, 47, 63, 83 |
| Answer» Go on adding 5, 8, 11, 14, 17, 20. So, the number 47 is wrong and must be replaced by 46. | |
| 21. |
1, 8, 27, 64, 124, 216, 343 |
| Answer» The numbers are 13, 23, 33, 43 etc. So, 124 is wrong; it must have been 53 i.e., 125. | |
| 22. |
5, 10, 13, 26, 29, 58, 61, (....) |
| Answer» Numbers are alternatively multiplied by 2 and increased by 3. So, the missing number = 61 x 2 = 122. | |
| 23. |
15, 31, 63, 127, 255, (....) |
| Answer» Each number is double the preceding one plus 1. So, the next number is (255 x 2) + 1 = 511. | |
| 24. |
1, 8, 27, 64, 125, 216, (....) |
| Answer» Numbers are 13, 23, 33, 43, 53, 63. So, the missing number is 73 = 343. | |
| 25. |
3, 7, 6, 5, 9, 3, 12, 1, 15, (....) |
| Answer» There are two series, beginning respectively with 3 and 7. In one 3 is added and in another 2 is subtracted. The next number is 1 - 2 = -1. | |
| 26. |
11, 13, 17, 19, 23, 29, 31, 37, 41, (....) |
| Answer» Numbers are all primes. The next prime is 43. | |
| 27. |
64, 71, 80, 91, 104, 119, 135, 155 |
| Answer» Go on adding 7, 9, 11, 13, 15, 17, 19 respectively to obtain the next number. So, 135 is wrong. | |
| 28. |
15, 16, 34, 105, 424, 2124, 12756 |
| Answer» 2nd 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. | |
| 29. |
10, 26, 74, 218, 654, 1946, 5834 |
| Answer» 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. | |
| 30. |
2880, 480, 92, 24, 8, 4, 4 |
| Answer» Go on dividing by 6, 5, 4, 3, 2, 1 respectively to obtain the next number. Clearly, 92 is wrong. | |
| 31. |
3, 7, 15, 27, 63, 127, 255 |
| Answer» Go on multiplying the number by 2 and adding 1 to it to get the next number. So, 27 is wrong. | |
| 32. |
19, 26, 33, 46, 59, 74, 91 |
| Answer» Go on adding 7, 9, 11, 13, 15, 17 respectively to obtain the next number. So, 33 is wrong. It must be 35 | |
| 33. |
1, 3, 10, 21, 64, 129, 356, 777 |
| Answer» A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on. So, 356 is wrong. | |
| 34. |
6, 12, 48, 100, 384, 768, 3072 |
| Answer» 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. | |
| 35. |
40960, 10240, 2560, 640, 200, 40, 10 |
| Answer» Go on dividing by 4 to get the next number. So, 200 is wrong. | |
| 36. |
8, 24, 12, 36, 18, 54, (....) |
| Answer» Numbers are alternatively multiplied by 3 and divided by 2. So, the next number = 54 ÷ 2 = 27. | |
| 37. |
2, 6, 12, 20, 30, 42, 56, (....) |
| Answer» The pattern is 1 x 2, 2 x 3, 3 x 4, 4 x 5, 5 x 6, 6 x 7, 7 x 8. So, the next number is 8 x 9 = 72. | |
| 38. |
4, -8, 16, -32, 64, (....) |
| Answer» Each number is the proceeding number multiplied by -2. So, the required number is -128. | |
| 39. |
7, 8, 18, 57, 228, 1165, 6996 |
| Answer» Let the given numbers be A, B, C, D, E, F, G. Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers. Clearly, 228 is wrong. | |
| 40. |
1, 1, 2, 6, 24, 96, 720 |
| Answer» Go on multiplying with 1, 2, 3, 4, 5, 6 to get next number. So, 96 is wrong. | |
| 41. |
196, 169, 144, 121, 100, 80, 64 |
| Answer» Numbers must be (14)2, (13)2, (12)2, (11)2, (10)2, (9)2, (8)2. So, 80 is wrong. | |
| 42. |
445, 221, 109, 46, 25, 11, 4 |
| Answer» Go on subtracting 3 and dividing the result by 2 to obtain the next number. Clearly, 46 is wrong. | |
| 43. |
190, 166, 145, 128, 112, 100, 91 |
| Answer» Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number. 190 - 24 = 166 166 - 21 = 145 145 - 18 = 127 [Here, 128 is placed instead of 127] 127 - 15 = 112 112 - 12 = 100 ... and so on. Therefore, 128 is wrong. | |
| 44. |
16, 33, 65, 131, 261, (....) |
| Answer» Each number is twice the preceding one with 1 added or subtracted alternatively. So, the next number is (2 x 261 + 1) = 523. | |
| 45. |
10, 5, 13, 10, 16, 20, 19, (....) |
| Answer» There are two series (10, 13, 16, 19) and (5, 10, 20, 40), one increasing by 3 and the other multiplied by 2. | |
| 46. |
1, 4, 9, 16, 25, 36, 49, (....) |
| Answer» Numbers are 12, 22, 32, 42, 52, 62, 72. So, the next number is 82 = 64. | |
| 47. |
2, 4, 12, 48, 240, (....) |
| Answer» Go on multiplying the given numbers by 2, 3, 4, 5, 6. So, the correct next number is 1440. | |
| 48. |
8, 7, 11, 12, 14, 17, 17, 22, (....) |
| Answer» There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22) increasing by 3 and 5 respectively. | |
| 49. |
46080, 3840, 384, 48, 24, 2, 1 |
| Answer» The terms are successively divided by 12, 10, 8, 6, ...etc. So, 24 is wrong, it should be 8 (48/6 = 8). | |
| 50. |
36, 54, 18, 27, 9, 18.5, 4.5 |
| Answer» The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it. | |