Select the number from among the given options that can replace the question mark (?) in the following series.
48, 54, 45, 51, 42, 48, ?
48+6 = 54
54-9 = 45
45+6 = 51
51-9 = 42
42+6 =Â 48
48-9 = 39
So here '39' will come in place of the question mark.
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