3. Without actual calculations, find the following sums.
(i) 1 + 3 + 5 + 7 + 9 +11
(ii) 1+3+5+7+9+ 11 + 13 + 15 + 17 +19+21
(iii) 11 +13 + 15 +17 + 19 + 21 + 23 + 25 + 27 +29
(iv) 13 + 15 + 17 + 19 + 21 + 23
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