Question 951805
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 = 100
100/10 = 10
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2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 = 90
90/9 = 10