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Question
1+2+3+4+------+99= কত?
4850
4950
4650
4750
ANSWER : 2
Descrption
<p>এখানে, মোট পদ n = 99 </p> <p>∴ সমষ্টি S = n(n + 1)/2</p> <p> = 99(99 + 1)/2</p> <p> = (99×100)/2</p> <p> = 4950 </p>
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