Problem by Rishabh Dubey 3
Algebra
Level
pending
Find the sum of 1^3+3^3+5^3+7^3+.....+97^3+99^3=?
123456789
192109401
999999999
198528959
192111111
198528954
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1 solution
n^2 (2n^2-1) =99^2(2×99^2-1) =9801(2×9801-1) =9801(19602-1) =9801×19601 =192109401