1 . a2 - 1 + 2b - b2 এর উৎপাদক কোনটি?
- A. (a - b - 1) (a + b - 1)
- B. (a - b + 1) (a + b - 1)
- C. (a + b - 1)
- D. (a - b + 1)
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