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[" Sum to n terms of "1.2.3+2.3.4+3.4.5+...

[" Sum to n terms of "1.2.3+2.3.4+3.4.5+......" is "],[[" 1) "(n(n+1)(n+2))/(2)," 2) "(n(n+1)(n+2)(n+3))/(4)],[" 3) "(n(n+1)(n+2)(n+3))/(6)," 4) none "]]

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