2.5, 3.5, 9, 40, ?
Find the next number in the above-given series?
2.5 × 1 + 1 = 3.5
3.5 × 2 + 2 = 9
9 × 4 + 4 = 40
40 × 8 + 8 = 328
Choose the odd word/letters/number/number pair from the given alternatives.
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