exam Maths Puzzle Numerical Ability

Science and medicine. The combined resistance of two resistors R1 and R2 in a
parallel circuit is given by the formula

Rt=1/1/R1+1/R2
Simplify the formula. Help please?

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exam Other Question
sqrt84x divided by sqrt3x in simplist form The result of dividing x4 - 2x3 + x2 - 3x + 2 by x - 2 is

I came up with x3 + x - 1
Is this right?