Question
Three of the following number-pairs are alike in some
manner and hence form a group. Which number-pair does not belong to that group? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)Solution
The logic followed here is as follows: In each pair of the form 'A-B': B = A X (A - 1) In option 'A', '24 – 552': = 24 X (24 - 1) = 24 X 23 = 552 In option 'B', ‘19 – 152': = 19 X (19 - 1) = 19 X 18 = 152 In option 'C', '15 – 210': = 15 X (15 - 1) = 15 X 14 = 210 In option 'D', '12 – 140': = 12 X (12 - 1) = 12 X 11 = 132 ≠ 140
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