What will come in place of the question mark ?) in the following number series ?
9, 10.8, 14.4, 21.6, ?, 64.8
9 + 1.8 = 10.8
10.8 + (2*1.8) = 10.8 + 3.6 = 14.4
14.4 + (2*3.6) = 14.4+7.2 = 21.6
21.6 + (2*7.2) = 21.6 + 14.4 = 36
Hence, option A is the right answer.
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