Find the next number in the series.
8, 17, 33, 67, 133, ?
267
Observe the pattern: 8·2 + 1 = 17; 17·2 − 1 = 33; 33·2 + 1 = 67; 67·2 − 1 = 133.
Multiplier alternates between +1 and −1 after doubling.
Next term: 133 × 2 + 1 = 267.
Hence, 267.
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