Exams › SSC CGL (Prelims) › General
In the number pairs below, the second number is obtained by applying the same mathematical operation(s) to the first. Find the pair that does NOT follow the common rule. Options: 18:42, 1:6, 15:34, 7:18
- 18 : 42
- 1 : 6
- 15 : 34
- 7 : 18
Correct answer: 18 : 42
Solution
The pattern for 1:6 (1x2+4=6), 15:34 (15x2+4=34), 7:18 (7x2+4=18) is n x 2 + 4. For 18:42, applying the rule gives 18x2+4=40, not 42. So 18:42 is the odd pair.
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