7. Without adding, find the sum.
(1) 1 + 3 + 5 + 7 + 9
(2) 1+3+5+7+9+ 11 +13 + 15 + 17 +19
(3) 1 + 3 + 5+7+9+ 11 +13 + 15 + 17 + 19 +21 + 23
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1. 25 djdjrirjririruhehdhd
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