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Complex sequence

Given sequence is 1+2+2+3+3+3+4+4+4+4 find sum.

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Hassan M. | Seek Value Over SuccessSeek Value Over Success
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1+2*2+3*3+4*4=1+4+9+16=30
The sum (total) is 30
Andre W. | Friendly tutor for ALL math and physics coursesFriendly tutor for ALL math and physics ...
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1² + 2² + 3² + 4² + .... + n² = n(n+1)(2n+1)/6