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
Simplify the formula

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exam Other Question

A group of people consists of 14 men and some women. One man and one woman can be selected in 252 ways. How many women are in the group?

the difference between 2x^2+4xy-3 and x^2-2xy-4?

My answer is x^2+6xy+1.

Thanks or your time!