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Rama09 [41]
3 years ago
15

Find the sum of ∑4/k=1 (-4k)

Mathematics
1 answer:
Annette [7]3 years ago
4 0

Answer:

Hello,

Answer C: -40

Step-by-step explanation:

\displaystyle \sum_{k=1}^4\ (-4k)\\\\=-4*\sum_{k=1}^4\ k\\\\=-4*4*\dfrac{1+4}{2} \\\\=-4*5*2\\\\=-40\\

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