UPSKILL MATH PLUS

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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 .