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1/9+1/18+1/30+1/45+1/63 ...... Find the ...

`1/9+1/18+1/30+1/45+1/63 `...... Find the sum of the infinite series

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`1/9+1/18+1/30+1/45+1/63...`
This is not a geometric series
`1/3(1/3+1/6+1/10+1/15+1/21..)`
`3=1/2(2*3)`
`6=1/2(3*4)`
`10=1/2(9*5)`
`1/2n(n+1)` where `n>=2`
`=1/3*2 sum_(n=2)^(oo)1/(n(n+1))`
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