Select the correct option that will fill in the blank and complete the series.
1440, 240, 48, ? , 4, 2
$$\frac{1440}{6}\ =\ 240$$
$$\frac{240}{5}\ =\ 48$$
$$\frac{48}{4}\ =\ 12$$
$$\frac{12}{3}=4$$
$$\frac{4}{2}=2$$
Hence 12 will come in place of question mark.
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