That Series Is Serious
Find the common term of this series: 1,9,36,100,225...... Woah!Woah!Woah! I know you will tell me it's 1^{2},3^{2},6^{2},10^{2},15^{2}.... but you can't find the 12th number of that series with this term instantly.Find an easier term and find the 12th number.I would'nt if you use that term too.
The answer is 6084.
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1 solution
The other term is 1^3,1^3+2^3+1^3+2^3+3^3....