Question
Three of the following four options are alike in a certain way and thus form a group. Which is the option 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.)
Solution
The logic followed here is: In each option, seven is added to the product of the 1st and 2nd number to obtain the 3rd number. In option A: 4 – 12 – 55 → 4 x 12 = 48; 48 + 7 = 55. In option B: 9 – 6 – 61 → 9 x 5 = 54; 54 + 7 = 61. In option C: 7 – 8 – 65 → 7 x 8 = 56; 56 + 7 = 63. In option D: 5 – 11 – 62 → 5 x 11 = 55; 55 + 7 = 62.
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