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গড় নির্ণয় করার# একদম সহজ নিয়ম। #1 + 2 + 3 + .............. +99 = কত?? যুক্তি:- (1ম পদ+শেষ পদ) × পদ সংখ্যা যোগফল = --------------- ------------------------ 2 (1 + 99) × 99 = -------------------------- 2 = 4950 Ans..... ।
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