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Select the number that can replace the question mark (?) in the following series.
8, 17, 9, 19, 10, 21, ?, ?
Given series is alternate series with two series are 8, 9, 10, ..... and 17, 19, 21, .......
The next number for the first series is 11
The next number for the second series is 23
$$\therefore\ $$The given series is 8, 17, 9, 19, 10, 21, 11, 23
Hence, the correct answer is Option C
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