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If n in N , then 1 2 + 2 3 + 3 4 + 4 5 + + n ( n + 1 )

If n in N

,

then

1 2 + 2 3 + 3 4 + 4 5 + +

n

(

n

+ 1) =

n

(

n

+ 1) (

n

+ 2)

3 .

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