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@satellite73
n(n+1) put n = 15, get 15 * (15+1) = 15 * 16
The answer is the first one. The 15 corresponds to the number of rows you would have if you continued your table, and if you notice, you started out in the first row on the right with a 2. So at the end of 15 rows, that number would be 16. So it would be 15 x 16.
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