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You can compare two different data sets on the same chart.
This is the lowest common multiple which is the smallest number greater than 0 which is a multiple of all the numbers. for example the lowest common multiple (lcm) of 4 and 6 is 12 as 12 is the first (smallest) number greater than 0 that is a multiple of both 4 and 6.
(2)50 = 1,125,899,906,842,624 possible different sets of answers for the entire test.
Your question was a little unclear in two ways: You said "using 3 digits". Are 1 and 2 digit numbers allowed? and If you reorder the numbers in a set, do you count it twice? For instance, if you had already counted the set 101, 102, 103, 104, 105, 106, would you also count 106, 105, 104, 103, 102, 101? If yes to both questions, there are 985,084,775,273,880,000 different sets. If yes to the first question, no to the second, there are 1,368,173,298,991,500 different sets. If no to the first question, yes to the second, there are 522,639,254,696,832,000 different sets. If no to both questions, there are 725,887,853,745,600 different sets. Hope this helped :).