Answer the three following questions: A. Find the equivalent resistance of 12Ω, 25Ω and 42Ω connected in series.   B. Find the equivalent resistance of three 30Ω light bulbs and two 20Ω heating elements connected in series.   C. Find the equivalent resistance of two strings of Christmas tree lights connected in series, if the first string has eight 4Ω bulbs in series and the second has twelve 3Ω in series.

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