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Omni-MATH / At the beginning of the first day, a box contains 1 black ball, 1 gold ball, and…

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problem

At the beginning of the first day, a box contains 1 black ball, 1 gold ball, and no other balls. At the end of each day, for each gold ball in the box, 2 black balls and 1 gold ball are added to the box. If no balls are removed from the box, how many balls are in the box at the end of the seventh day?

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