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![\frac{1}{\lambda} = R(Z-1)^2 [\frac{1}{n_1^2 - \frac{1}{n^2_2}}]](/tpl/images/0183/5932/4bea5.png)
![\frac{1}{\lambda} = R(30-1)^2 [\frac{1}{1} - \frac{1}{4}]](/tpl/images/0183/5932/8743d.png)
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