1 + 2 + 3 + \dots + n < \frac { 1 } { 8 } ( 2 n + 1 ) ^ { 2 } – InterviewSolution

1.	1 + 2 + 3 + \dots + n < \frac { 1 } { 8 } ( 2 n + 1 ) ^ { 2 }
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