without adding find the some of 1+3+5+7+9+11+13+15+17+19+21
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1+3+5+7+9+11+13+15+17+19+21
1+3+5+7+9+11+13+15+17+19+21Since, there are 12 consecutive odd numbers, Thus, their sum = 11^2
=121
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Answer:
121 is the correct answer
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