Equivalent resistance of N resistors arranged in parallel:
"R_T=1\/\\displaystyle\\sum_{i=1}^N1\/R_i"
"R_T = 1\/(1\/5 + 1\/3 + 1\/4) = 60\/(12 + 20 + 15) = 60\/47 \\approx 1.277\\quad(\\Omega)"
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