Without doing the actual addition, find the sum of 1+3+5+....+57+59+61
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Without doing the actual addition, find the sum of 1+3+5+....+57+59+61
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Without adding, find the sum
Answer
1 + 3 +5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23 = 12² = 144