సంకలనం చేయండి: \(\frac{1}{2} + \frac{1}{6} + \frac{1}{{12}} + \frac{1}{{20}} + \frac{1}{{30}} + \frac{1}{{42}}\)

1
19 / 21
2
6 / 7
3
5 / 7
4
16 / 21

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