Electric Circuits
Three element having conductance G1, G2 and G3 are connected in parallel. Their combined conductance will be

 (G1 + G2 + G3) - 1.
 G1 + G2 + G3.
 1 / G1 + 1 / G2 + 1 / G3.
 (1 / G1 + 1 / G2 + 1 / G3) - 1.

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