Question : Directions: Three of the following four triads are alike in a certain way as they are formed by performing the same mathematical operations among themselves and thus form a group. Which triad does NOT belong to that group?
Option 1: 2 : 5 : 8
Option 2: 5 : 10 : 125
Option 3: 12 : 25 : 1728
Option 4: 3 : 7 : 27
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Correct Answer: 5 : 10 : 125
Solution :
Let's check the given options –
First option:
(2 : 5 : 8)→((2 × 2) + 1) = 4 + 1 = 5; (2)
3
= 8
Second option:
(5 : 10 : 125)→((5 × 2) + 1) = 10 + 1 = 11 ≠ 10; (5)
3
= 125
Third option:
(12 : 25 : 1728)→((12 × 2) + 1) = 24 + 1 = 25; (12)
3
= 1728
Fourth option:
(3 : 7 : 27)→((3 × 2) + 1) = 6 + 1 = 7; (3)
3
= 27
So, only the second option is different from the others. Hence, the second option is correct.
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