Menyelesaikan the of the following n sum r=1 r(r+1)(r+2) | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$\frac { n } { 5 - 1 }$$