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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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?
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