Compute the equivalent resistance of (a) 3.0 , 6.0 , and 9.0 in parallel; (b) 3.0

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Compute the equivalent resistance of 

(a) 3.0 Ω, 6.0 Ω, and 9.0 Ω in parallel; 

(b) 3.0 Ω, 4.0 Ω, 7.0 Ω, 10.0 Ω, and 12.0 Ω in parallel; 

(c) Three 33-Ω heating elements in parallel;

(d) Twenty 100-Ω lamps in parallel.

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