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## Homework Statement

[itex]\mu = \frac{mM}{m+M}[/itex]

a. Show that [itex]\mu = m[/itex]

b. Express [itex]\mu[/itex] as m times a series in [itex]\frac{m}{M}[/itex]

## Homework Equations

[itex]\mu = \frac{mM}{m+M}[/itex]

## The Attempt at a Solution

I am having trouble seeing how to turn this into a series. How can I look at the given function differently and see a series in it?