[A]. 54
[B]. 56
[C]. 64
[D]. 81
✅ The correct answer is option C.
Numbers are 12, 22, 32, 42, 52, 62, 72.
So, the next number is 82 = 64.
Numbers are 12, 22, 32, 42, 52, 62, 72.
So, the next number is 82 = 64.
Aptitude
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22. Insert the missing number.: 2, 6, 12, 20, 30, 42, 56, (….)
[A]. 61
[B]. 64
[C]. 72
[D]. 70
✅ The correct answer is option C.
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.
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.
23. Find out the wrong number in the given sequence of numbers.: 5, 16, 6, 16, 7, 16, 9
[A]. 9
[B]. 7
[C]. 6
[D]. None of these
✅ The correct answer is option A.
Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16.
So, 9 is wrong.
Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16.
So, 9 is wrong.
24. Find out the wrong number in the series.: 6, 12, 48, 100, 384, 768, 3072
[A]. 768
[B]. 384
[C]. 100
[D]. 48
✅ The correct answer is option C.
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.
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.
25. Insert the missing number.: 7, 26, 63, 124, 215, 342, (….)
[A]. 481
[B]. 511
[C]. 391
[D]. 421
✅ The correct answer is option B.
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.
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.
26. Find out the wrong number in the given sequence of numbers.: 105, 85, 60, 30, 0, -45, -90
[A]. 0
[B]. 85
[C]. -45
[D]. 60
✅ The correct answer is option A.
Subtract 20, 25, 30, 35, 40, 45 from successive numbers.
So, 0 is wrong.
Subtract 20, 25, 30, 35, 40, 45 from successive numbers.
So, 0 is wrong.
27. Find out the wrong number in the series.: 10, 26, 74, 218, 654, 1946, 5834
[A]. 26
[B]. 74
[C]. 218
[D]. 654
✅ The correct answer is option D.
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.
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.
28. Find out the wrong number in the given sequence of numbers.: 56, 72, 90, 110, 132, 150
[A]. 72
[B]. 110
[C]. 132
[D]. 150
✅ The correct answer is option D.
The numbers are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13.
So, 150 is wrong.
The numbers are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13.
So, 150 is wrong.
29. Find out the wrong number in the series.: 3, 7, 15, 39, 63, 127, 255, 511
[A]. 7
[B]. 15
[C]. 39
[D]. 63
✅ The correct answer is option C.
Go on multiplying 2 and adding 1 to get the next number.
So, 39 is wrong.
Go on multiplying 2 and adding 1 to get the next number.
So, 39 is wrong.
30. Find out the wrong number in the given sequence of numbers.: 1, 2, 6, 15, 31, 56, 91
[A]. 31
[B]. 91
[C]. 56
[D]. 15
✅ The correct answer is option B.
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.
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.