Sn=1/1.3+1/2.4+1/3.5+1/4.6+……+1/n(n+2)

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Sn=1/1.3+1/2.4+1/3.5+1/4.6+……+1/n(n+2)
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Sn=1/1.3+1/2.4+1/3.5+1/4.6+……+1/n(n+2)
Sn=1/1.3+1/2.4+1/3.5+1/4.6+……+1/n(n+2)

Sn=1/1.3+1/2.4+1/3.5+1/4.6+……+1/n(n+2)