Question 53

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

Solution

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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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