Question
Download Solution PDFThree of the following four triads are alike in a certain way as they are formed by performing same mathematical operations among themselves and thus form a group. Which triad does NOT belong to that group?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFLogic: First no. : (First no. × 2) : [(First no.)3 - 1]
Checking all the given options:
(1) 9 : 18 : 728 →
⇒ (9) : (9 × 2) : [(9)3 - 1)]
⇒ (9) : (18) : [(729 - 1)]
⇒ 9 : 18 : 728
(2) 6 : 12 : 215 →
⇒ (6) : (6 × 2) : [(6)3 - 1)]
⇒ (6) : (12) : [(216 - 1)]
⇒ 6 : 12 : 215
(3) 2 : 4 : 7 →
⇒ (2) : (2 × 2) : [(2)3 - 1)]
⇒ (2) : (4) : [(8 - 1)]
⇒ 2 : 4 : 7
(4) 5 : 10 : 126 →
⇒ (5) : (5 × 2) : [(5)3 + 1)]
⇒ (5) : (10) : [(125 + 1)]
⇒ 5 : 10 : 126
Here, in '5 : 10 : 126' different logic is followed.
Hence, the correct answer is "Option (4)".
Last updated on Jul 14, 2025
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