byungseul
byungseul
25-07-2016
Mathematics
contestada
4Σk=1 k(k+4) Find the sum.
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dalendrk
dalendrk
31-07-2016
[tex]\sum\limits_{k=1}^{4}k(k+4)=1(1+4)+2(2+4)+3(3+4)+4(4+4)\\\\=5+12+21+32=70[/tex]
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