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This can be found 2 ways: a) the long way 1+3+5+7+9+11+13+15+17+19= 100 or b) the twentieth odd number is 19. 1 +19 = 20, 3+ 17 = 20, etc. there are 5 pairs of this meaning five pairs of numbers that add up to 20. 5x20 = 100.

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Q: What is the sum of the first 10 positive odd numbers?
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