Question
In the following question, four number pairs are given.
In each pair the number on left side of (-) is related to the number of the right side of (-) with some Logic/Rule/Relation. Three pairs are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives. (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 first number is divided by 3 and then 5 is added to the number to get the second number. 45 - 20 → (45 ÷ 3 + 5) = (15 + 5) = 20 78 - 31 → (78 ÷ 3 + 5) = (26 + 5) = 31 84 - 38 → (84 ÷ 3 + 5) = (28 + 5) = 33 ≠38 39 - 17 → (39 ÷ 3 + 5) = (13 + 5) = 18
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