1. The following numbers form a series. Find the odd one out.
56, 58, 62, 70, 86, 120, 182
A. 120
B. 58
C. 182
D. 62
E. 86
Answer: Option (A)
Explanation:
The series follows the pattern
56 + [latex]2^1[/latex] = 58, 58 + [latex]2^2[/latex] = 62, 62 + [latex]2^3[/latex] = 70, 70 + [latex]2^4[/latex] = 86, 86 + [latex]2^5[/latex] = 118, 118 + [latex]2^6[/latex] = 182
Therefore, 118 should be in place of 120.
2. The following numbers form a series. Find the odd one out.
733, 365, 181, 89, 38, 20
A. 365
B. 181
C. 89
D. 38
E. 20
Answer: Option (D)
Explanation:
The series follows the pattern
(733 – 3) ÷ 2 = 365, (365 – 3) ÷ 2 = 181, (181 – 3) ÷ 2 = 89, (89 – 3) ÷ 2 = 43, (43 – 3) ÷ 2 = 20
Therefore, 43 should be in place of 38.
3. The following numbers form a series. Find the odd one out.
5, 21, 101, 501, 2510, 12501
A. 101
B. 21
C. 2510
D. 12501
E. 501
Answer: Option (C)
Explanation:
The series follows the pattern
5 × 5 – 4 = 21, 21 × 5 – 4 = 101, 101 × 5 – 4 = 501, 501 × 5 – 4 = 2501, 2501 × 5 – 4 = 12501
Therefore, 2501 should be in place of 2510.
4. The following numbers form a series. Find the odd one out.
1, 13, 37, 73, 125, 181
A. 13
B. 37
C. 73
D. 125
E. 181
Answer: Option (D)
Explanation:
The series follows the pattern
1 + (11 × 1 + 1) = 13, 13 + (11 × 2 + 2) = 37, 37 + (11 × 3 + 3) = 73, 73 + (11 × 4 + 4) = 121, 121 + (11× 5 + 5) = 181
Therefore, 121 should be in place of 125.
5. The following numbers form a series. Find the odd one out.
1, 4, 12, 27, 47, 86
A. 4
B. 12
C. 27
D. 47
E. 86
Answer: Option (D)
Explanation:
The series follows the pattern
1 + [latex]2^2[/latex] – 1 = 4, 4 + [latex]3^2[/latex] – 1 = 12, 12 + [latex]4^2[/latex] – 1 = 27, 27 + [latex]5^2[/latex]– 1 = 51, 51 + [latex]6^2[/latex]– 1 = 86
Therefore, 51 should be in place of 47.