Select the number from among the given options that can replace the question mark (?) in the following series.
864, 432, 216, 108,?
$$\frac{864}{2} = 432$$
$$\frac{432}{2} = 216$$
$$\frac{216}{2} = 108$$
$$\frac{108}{2} = 54$$
Hence 54 will come in place of the question mark.
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