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1. 1+2+3+4+------+99= কত?
- A. 4850
- B. 4850
- C. 4850
- D. 4850
Answer: Option B
Explanation:
এখানে, মোট পদ n = 99
∴ সমষ্টি S = n(n + 1)/2
= 99(99 + 1)/2
= (99×100)/2
= 4950
∴ সমষ্টি S = n(n + 1)/2
= 99(99 + 1)/2
= (99×100)/2
= 4950
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