Select the number from among the given options that can replace the question mark (?) in the following series.
6, 9, 7, 10, 8, 11, ?
6+3 = 9
9-2 = 7
7+3 = 10
10-2 = 8
8+3 = 11
11-2 = 9
Hence '9' will come in place of the question mark.
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