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Q:

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?

  • 1
    11 : 21: 121
  • 2
    7 : 15: 49
  • 3
    2 : 3: 4
  • 4
    9 : 17: 81
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Answer : 2. "7 : 15: 49"

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