Question
Three of the following four number-pairs are alike in a
certain way and thus form a group. Which is the pair that 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 is 13 x 9 = 117 15 x 9 = 135 18 x 9 = 162 11 x 9 = 99
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