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Write the Statements Sk and Sk+1 Sn:12+42+72++(3n2)2=n(6n23n1)2S _ { n } : 1 ^ { 2 } + 4 ^ { 2 } + 7 ^ { 2 } + \ldots + ( 3 n - 2 ) ^ { 2 } = \frac { n \left( 6 n ^ { 2 } - 3 n - 1 \right) } { 2 }

Question 240

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Write the statements Sk and Sk+1.
- Sn:12+42+72++(3n2)2=n(6n23n1)2S _ { n } : 1 ^ { 2 } + 4 ^ { 2 } + 7 ^ { 2 } + \ldots + ( 3 n - 2 ) ^ { 2 } = \frac { n \left( 6 n ^ { 2 } - 3 n - 1 \right) } { 2 }

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\[\begin{array} { l }
\mathrm { S } _ {...

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