Exams › SSC CGL (Prelims) › General
In each of the following number pairs, the second number is obtained by applying the same mathematical operation(s) to the first number. Identify the pair that does NOT follow the common rule.
- 128 : 8
- 288 : 12
- 350 : 15
- 18 : 3
Correct answer: 350 : 15
Solution
128/8=16=4^2, 288/12=24 (not a perfect square), 18/3=6. The rule appears to be square root: sqrt(128)=8sqrt(2) — let's try: 128=8^2*2 no. Check: 128/16=8, 288/24=12, 18/6=3, 350/23.3≈15. The ratio 128:8=16, 288:12=24, 18:3=6 are all integers, but 350:15=23.3 is not — 350 is not divisible by 15 exactly (350/15=23.33). Hence 350:15 is the odd one out.
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