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Answer : 4 25 Explanation : Answer: D) 25 Explanation: We know that, to be in the form that the number of rows and the number of columns to be equal the number should be a perfect square (a2).Given number is 1200The perfect number which is above and near to 1200 is 1225 which is 35  35.Therefore, The minimum number of coins he need is 25.

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