S=1+3+5+....+(2n-5)+(2n-3)+(2n-1)이라고하면 S=1+3+5+....+(2n-5)+(2n-3)+(2n-1) +S=(2n-1)+(2n-3)+(2n-5)+....+5+3+1 2S=2n+2n+2n+....+2n+2n+2n=2n제곱
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