3- (10 points) For the following circuit a) Find the equivalent resistance seen by the current source b) How much voltage is provided by the current source? c) Find the current in R1 and in R3 $R_1$ 60 $\Omega$ 2.5 A $R_3$ 30 $\Omega$ $R_2$ 20 $\Omega$ $R_4$ 30 $\Omega$ $R_5$ 30 $\Omega$
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