Question
In each of the number-pairs, the second number is
obtained by performing a certain mathematical operation on the first number. Three of the following pairs follow the same pattern and thus form a group. Select the number-pair that does NOT belong to that group.Solution
The logic is- 21 x 21 = 421 -21 = 420 25 x 25 = 625 – 25 = 600 17 x 17 = 289 – 17 = 272 15 x 15 = 225 – 15 = 210 Hence option 4 is true
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