7. Without adding, find the sum.
( 1+3+5+7+9
() 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 +19
(m) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 +23
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1+3+5+7+9=4^2=16
1+3+————-+19 =100
1+3+_________+23=144
1+3+————-+19 =100
1+3+_________+23=144
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