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in গনিত - মানসিক দক্ষতা ও ধাঁধা by Earnings: 2.48 Usd (2,415 points)

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এখানে, মোট পদ n = 18

∴ সমষ্টি S = n(n + 1)/2

= 18(18 + 1)/2

= (18×19)/2

= 171
by Earnings: 2.48 Usd (2,415 points)

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