An arrangement of marbles has 12 marbles in the first row and 10 rows in all. In each successive row one marble is added.
What is the explicit rule for this situation, and how many marbles will be in the 10th row?
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Explicit rule
Number of marbles in the 10th row
An = 11 + 11n, An = 12 + n, An = 11 + n, An = 12 + 10n, 19, 20, 21,
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