Find the \( n \)th term and the sum of \( n \) terms of the series ...

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Find the \( n \)th term and the sum of \( n \) terms of the series :
\[
\frac{1}{1 \times 4}+\frac{1}{4 \times 7}+\frac{1}{7 \times 10}+\ldots
\]
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