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1. a3 - 21a - 20 এর একটি উৎপাদক হলো---
- A. (a + 2)
- B. (a + 2)
- C. (a + 2)
- D. (a + 2)
Answer: Option B
Explanation:
a3 - 21a - 20 = a2(a + 1) - a(a + 1) - 20(a + 1) = (a + 1)(a2 - a - 20)
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