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JEEMAIN and NEET
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Mathematics
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Class11
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Sequence and Series
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Q)
If $S_{n}=\large{1}{6}\;n(n+1)(n+2)$ $\forall\;n\;\geq\;1$, then $\displaystyle\lim_{n \to \infty}\;\displaystyle\sum_{r=1}^{n}\;\large\frac{1}{a_{r}}$ equals
$(a)\;1\qquad(b)\;2\qquad(c)\;3\qquad(d)\;6$
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