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2.5, 3.5, 9, 40, ? Find the next number in the above-given series?

Correct Answer: 328

Explanation:

2.5 × 1 + 1 = 3.5


3.5 × 2 + 2 = 9


9 × 4 + 4 = 40


40 × 8 + 8 = 328


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