Which of the following is equivalent to (a^-1 + b^-1)^-1 [open parenthesis a to the power of negative 1 plus b to the power of negative 1 close parenthesis to the power of negative 1]?
W) ab / (a+b) [the fraction with numerator ab and denominator a plus b]
X) a + b
Y) a^2b^2
Z) ab
✔️Answer:W) ab / (a+b)
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