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: 11 : 21 : 121
Option 2: 7 : 15 : 49
Option 3: 2 : 3 : 4
Option 4: 9 : 17 : 81
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Correct Answer: 7 : 15 : 49
Solution :
Let's check each option –
First option:
11 : 21 : 121→(11 × 2) – 1 = 22 – 1 = 21; 11
2
= 121
Second option:
7 : 15 : 49→(7 × 2) – 1 = 14 – 1 = 13 ≠ 15; 7
2
= 49
Third option:
2 : 3 : 4→(2 × 2) – 1 = 4 – 1 = 3; 2
2
= 4
Fourth option:
9 : 17 : 81→(9 × 2) – 1 = 18 – 1 = 17; 9
2
= 81
Hence, the second option is correct.
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