Question
Four number pair have been given, out of which three
are alike in a certain way and one is different. Select the one that is different. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g., 13 - operation 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 is as follows: In each pair, the second number = (First number)² - 4. Option 'A': 16 – 252 → 16² - 4 = 256 - 4 = 252 Option 'B': 20 – 396 → 20² - 4 = 400 - 4 = 396 Option 'C': 15 – 221 → 15² - 4 = 225 - 4 = 221 Option 'D': 11 – 117 → 11² - 4 = 121 - 4 = 117
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