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8.5

The sequence is 1 -- 1.25 -- 7 -- 7.5 -- 2 -- 2.25 -- 8
The sequence of addition and subtraction is +.25 -- +5.75 -- +.50 -- -5.5 -- +.25 -- +5.75 so the next number must be 8 +.50

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Q: 1 1.25 7 7.50 2 2.25 8?
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