Select the correct option that will fill in the blank and complete the series.
18, 36, 108, 432, 2160, .............
$$18\times2 =36$$
$$36\times3 = 108$$
$$108\times4 = 432$$
$$432\times5 = 2160$$
$$2160\times6= 12960$$
18, 36, 108, 432, 2160, 12960
Option B is correct.
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