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byungseul byungseul
  • 24-07-2016
  • Mathematics
Answered

4Σk=1 k(k+4) Find the sum.

Verified Answer :

dalendrk
dalendrk dalendrk
  • 31-07-2016

\(\sum\limits_{k=1}^{4}k(k+4)=1(1+4)+2(2+4)+3(3+4)+4(4+4)\\\\=5+12+21+32=70\)

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