Logical Reasoning :: Number Series - Discussion

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Explanation:
11.5 =11.5
11.5 +(6) = 17.5
17.5 +(6*3) = 17.5 + 18 = 35.5
35.5 +(18*3) = 35.5 + 54 = 89.5
89.5 +(54*3) = 89.5 + 162 = 251.5