Exams › SSC CGL (Prelims) › General
Three of the four triads below follow the same mathematical rule and form a group. Which triad does NOT belong to the group?
- 36 : 13 : 7
- 16 : 9 : 5
- 72 : 16 : 8
- 1 : 3 : 2
Correct answer: 72 : 16 : 8
Solution
The rule is: first number = (second - third)^2. 36=(13-7)^2 ✓, 16=(9-5)^2 ✓, 1=(3-2)^2 ✓, but 72 ≠ (16-8)^2 = 64. So 72:16:8 does not fit the pattern.
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