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Which one of the following is a correct statement for a number of unequal resistors connected in series or parallel?

a) The total resistance in series is always greater than the total resistance in parallel
b) The total resistance in parallel is always greater than the total resistance in series
c) The total resistance in series is equal to the sum of the resistances of individual resistors
d) The total resistance in parallel is equal to the sum of the reciprocals of the resistances of individual resistors

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