exam Maths Puzzle Numerical Ability

The combined resistance of two resistors in a parallel circuit is given by the formula

RT=1/(1/R1+1/R2)



Simplify the formula.

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exam Other Question
If 6/3 is multiplied by its reciprocal, the products equals_________. subtract
2x/x^2 - 13x + 42 - 7/ x-6