Select the correct option that will complete the series.
900, 450, 90, 45, 9, ?
$$900\times\ \frac{1}{2} =Â 450$$
$$450\times\ \frac{1}{5} = 90$$
$$90\times\ \frac{1}{2} = 45$$
$$45\times\ \frac{1}{5} = 9$$
$$9\times\ \frac{1}{2} = 4.5$$
Hence 4.5 will come in place of question mark.
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