What is the next number in the sequence below?3     2     6     4     9     61012158

The sequence seems to be alternating between subtracting one and doubling the result. Let's break it down:

• Start with 3, subtract 1 to get 2.
• Double 2 to get 4.
• Subtract 1 from 4 to get 3, but the next number in the sequence is 6, not 3. So, it seems there's a mistake in the sequence.

If we correct the sequence to: 3, 2, 4, 3, 6, 5, 10, 9, 18, 17, the next number would be 34 (double of 17).

But if we follow the original sequence: 3, 2, 6, 4, 9, 6, 10, 12, 15, 8, the pattern is not clear and it's hard to predict the next number.