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What comes next in the sequence; 1, 3, 9, 31, ?

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What comes next in the sequence; 1, 3, 9, 31, ?
posted Jun 2, 2018 by Nikita Sehgal

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1 Answer

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117
*4-1, *4-3, *4-5, *4-7

answer Jun 8, 2018 by anonymous
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