What will come in place of the question mark ?) in the following number series ?
13, 6, 5, 6, 10, ?
13*0.5 - 0.5 = 6.5-0.5 = 6
6*1 - 1 = 6-1 = 5
5*1.5 - 1.5 = 7.5 - 1.5 = 6
6*2 - 2 = 12-2 = 10
10*2.5 - 2.5 = 25-2.5 =22.5
Option E is the right answer.
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