Select the number that can replace the question mark (?) in the following series.
4, 2, 2, 3, 6, ?
$$4\times0.5 = 2$$
$$2\times1 = 2$$
$$2\times1.5 = 3$$
$$3\times2 = 6$$
$$6\times2.5 = 15$$
Hence 15 will come in place of question mark.
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