1st circle: 0 + 1 + 2 + . . . + 24 = 300 = 1 * 300 2nd circle: 24 + 25 + 26 + . . . + 48 = 900 = 3 * 300 3rd circle: 48 + 49 + 50 + . . . + 72 = 1,500 = 5 X 300 4th circle: 72 + 73 + 74 + . . . + 96 = 2,100 = 7 * 300
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