A rule in terms of n for the sum of the first n odd positive integers is ?

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sum av odd positiv integers & start with 1 alwaes = a square . . . . 1+3=4=2^2 . . . 1+3+5=9=3^2 . . . 2+3+5+7=16=4^2 . . . . sum n terms...1+3+5+....(2n-1)=n^2
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