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Assuming that series is 88, 87, 85, 81, 73, 57 the next number is 25.
The difference each time is twice the previous difference:
88 → 87 : 88 - 87 = 1
87 → 85 : 87 - 85 = 2 = 1 x 2
85 → 81 : 85 - 81 = 4 = 2 x 2
81 → 73 : 81 - 73 = 8 = 4 x 2
73 → 57 : 73 - 75 = 16 = 8 x 2
→ next difference is 16 x 2 = 32
→ next number is 57 - 32 = 25
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