Question 53

Complete the series.
10, 20, 10, 9, 21, 11, 8, 22, 12, (...)

Solution

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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