Select the number that can replace the question mark (?) in the following series.
600, 120, 30, 10, 5, ?
$$\frac{600}{5}\ =\ 120$$
$$\frac{120}{4}\ =\ 30$$
$$\frac{30}{3}\ =\ 10$$
$$\frac{10}{2}\ =\ 5$$
$$\frac{5}{1}\ =\ 5$$
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