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Omni-MATH / One writes 268 numbers around a circle, such that the sum of 20 consectutive…

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problem

One writes 268 numbers around a circle, such that the sum of 20 consectutive numbers is always equal to 75. The number 3, 4 and 9 are written in positions 17, 83 and 144 respectively. Find the number in position 210.

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