Find bv the method of Undetermined Coefficients the sum of \( 1 \cdot 2 \cdot 3+2 \cdot 3 \cdot ...

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Find bv the method of Undetermined Coefficients the sum of \( 1 \cdot 2 \cdot 3+2 \cdot 3 \cdot 4+3 \cdot 4 \cdot 5+\ldots \) to \( n \) terms.
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