An electrician has two resistances. By joining them in series or in parallel combinations, he is able to obtain resistances of 3 Ω, 4 Ω, 12 Ω and 16 Ω. Identify the two resistances with him.

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An electrician has two resistances. By joining them in series or in parallel combinations, he is able to obtain resistances of 3 Ω, 4 Ω, 12 Ω and 16 Ω. Identify the two resistances with him.