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Without adding find the sum.
1. \(1+3+5+7+9\)
The sum of \(1+3+5+7+9\) is .
2. \(1+3+5+7+9+11+13+15+ 17+19\)
The sum of \(1+3+5+7+9+11+13+15+ 17+19\) is .
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