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Answer: **9**

The difference between numbers in the series increments by 1 each time:

- 29 minus 27 is
**2** - 27 minus 24 is
**3** - 24 minus 20 is
**4** - 20 minus 15 is
**5**

The last number in the series is 15 minus 6 = **9**.

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Make money from home during lockdown. Average payout is around £200.