math

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pls. explain how to get this:
A number x is the harmonic mean of two
numbers a and b if 1/x
is the mean of 1/a
and 1/b.
a) Write an equation to represent the harmonic
mean of a and b.
b) Determine the harmonic mean of 12 and 15.
c) The harmonic mean of 6 and another
number is 1.2. Determine the other number.
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184 MHR

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