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1, 3, 9, 23, 53, 115, _____

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241

240

250

230

answer is A.

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Detailed Solution

$\begin{array}{l} 1 \times 2 + 1 = 3 \\ 3 \times 2 + 3 = 9 \\ 9 \times 2 + 5 = 23 \\ 23 \times 2 + 7 = 53 \\ 53 \times 2 + 9 = 115 \\ 115 \times 2 + 11 = 241 \end{array}$

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