3 \cdot 1 ^ { 2 } + 4 \cdot 2 ^ { 2 } + 5 \cdot 3 ^ { 2 } + \dots + ( – InterviewSolution

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1.	3 \cdot 1 ^ { 2 } + 4 \cdot 2 ^ { 2 } + 5 \cdot 3 ^ { 2 } + \dots + ( n + 2 ) \cdot n ^ { 2 }
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