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
16, 32, 68, 132, ?, 376
What will come in place of the question mark (?) in the following series?
60, 94, 184, 464, 1388, ?
Complete the series choosing the missing number.
110, 99, 86, ___, 54, 35.
380, ?, 360, 324, 260, 160
8      27       64      125     ?       343Â
...137, 130, ?, 95, 67, 32
2, 13, 27, 44, ?, 87
What will come in place of the question mark (?) in the following series?
20, ?, 30, 60, 150, 450
5   3   4   7.5   17    ?    138
1290, 1225, 1175, ?, 1112, 1095, 1085
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