Question

What is (a)the highest (b)the lowest resistance that can be secured by combinations of four coils of resistanve 4,12,8,24 ohm?

Answer 1

Highest will be by series = 4+12+8+24=48 ohms

Lowest will be by parallel = 1/R =1/4+1/8+1/24+1/12 = 12/24 = 1/2 
                                         so R = 2

Answer 2

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