1 . (2a + 5b + 3c)2 + (5b + 3c - a)2 - 2 (2a + 5b + 3c) (5b + 3c - a) এর সরলকৃত রূপ কোনটি?
- A. 4ab
- B. 9a2
- C. 6b2
- D. 4a2
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