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      Question

      The second number in each of the number-pairs is

      obtained by performing certain mathematical operations on the first number. Three of the following four number-pairs follow the same pattern and thus form a group. Select the number- pair that does NOT belong to that group.
      A 18 : 321 Correct Answer Incorrect Answer
      B 21 : 438 Correct Answer Incorrect Answer
      C 17 : 286 Correct Answer Incorrect Answer
      D 19 : 357 Correct Answer Incorrect Answer

      Solution

      The logic is- 182 = 324 тАУ 3 = 321 212 = 441 тАУ 3 = 438 172 = 289 тАУ 3 = 289 192 = 361 тАУ 3 = 358

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