6 piles of marbles are arranged in a triangle pattern. Each side of the triangle has a total of 9 marbles. Add 1 more marble to one of the piles, so that the total number of marbles on each side remains 9. You are allowed to move the marbles but not take any out.

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We arrange our marble as in 6 piles of marbles are arranged in a triangle pattern. Each side of the triangle has a total of 9 marbles :



And


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