Find the next number in the given series
0,3,9,21,45,?

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• A 91
• B 92
• C 93
• D 95

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Answer: C. 93

Each term is double the previous one plus 3: 0 x 2 + 3 = 3, 3 x 2 + 3 = 9, 9 x 2 + 3 = 21, 21 x 2 + 3 = 45. So 45 x 2 + 3 = 93.

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