General Knowledge Economy

Find the correct formula to compute the rate of effective protection.  

1
\(g=\frac{t+a_i t_i}{1-a_i}\)
2
\(g=\frac{t-a_i t_i}{1+a_i}\)
3
\(g=t+\frac{a_i t_i}{1+a_i}\)
4
\(g=\frac{t-a_i t_i}{1-a_i}\)

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