Complete the series.
10, 20, 10, 9, 21, 11, 8, 22, 12, (...)
10, 20, 10, 9, 21, 11, 8, 22, 12, (...)
In this series there are 3 alternate series are there
10 - - 9 - - 8 - - 7
- 20- -21 --22--
--10--11--12--
so the next no. Be 7
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