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There is not enough information to answer the question.

The pattern could be

1 (+1) = 2 (+3) = 5 (+5) = 10 ... where the differences are the odd integers,

or

1 (+1) = 2 (+3) = 5 (+6) = 11 ... where the differences are the triangular numbers,

or

1 (+1) = 2 (+3) = 5 (+9) = 14 ... where the differences are powers of 3,

or many, many other possibilities.

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13y ago

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