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In the following question, select the missing number from the given series.
13, 16, 11, 18, 9, 20, ?
Expression : 13, 16, 11, 18, 9, 20, ?
It is a combination of 2 series at alternate positions, one is a decreasing odd series and other is the increasing even number series.
Thus, missing number is part of odd series : 13, 11, 9, 7
=> Ans - (D)
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