Find first 3 terms of the binomial expansion (1-2b)⁻⁴

University of Ilorin MTH101 2025C past question

1. 1 + 8b + 40b²
2. 1 - 8b + 40b²
3. 1 + 8b - 40b²
4. 1 - 8b - 40b²

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