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To solve a problem such as this, we must first determine the pattern that has created the already existing list:

61 68 82 92 103 107

+7 +14 +10 +11 +4

If you look at the numbers that have obviously been added to get the new number, it should be obvious (laying the problem out like this) that those numbers are derived by adding the digits of the previous number and then adding the sum of those digits to that same number. For example:

61 = 6 + 1 = 7, therefore 61 + 7 = 68
68 = 6 + 8 = 14, therefore 68 + 14 = 82 and so on...

Thus, the answer would be 107 = 1 + 0 + 7 = 8, therefore 107 + 8 = 115

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14y ago
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Q: What number should replace the mark 61 68 82 92 103 107?
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