3
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Replace the "?" in the following sequence:$ $
2 7 10 13 14 22 26 27 28 31 49 53 54 57 78 79 ? 90 101 106 109 110 111

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3
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The solution is:

81a

The numbers in the sequence are the op. numbers belonging to sonata 1 to 32 from Beethoven. The missing one is sonata 26.

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