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3, 6, 17.5, 64.75, ?

Correct Answer: 295.875

Explanation:

3


3 x 1.5 + 1.5 = 6


6 x 2.5 + 2.5 = 17.5


17.5 x 3.5 + 3.5 = 64.75


64.75 x 4.5 + 4.5 = 295.875


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