18 multiply by 902 - 6 + 521

Mathematics

1 answer:

trapecia [35]1 year ago

4 0

Answer:

16751

Step-by-step explanation:

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Determine the sum of the arithmetic series: 5+18 +31 +44 + ... 161.

Finger [1]

Answer:

1079

Step-by-step explanation:

Hello,

18-5 = 13

31-18=13

44-31=13

161=5+13*12

So we need to compute

$\displaystyle \sum_{k=0}^{k=12} \ {(5+13k)}\\\\=\sum_{k=0}^{k=12} \ {(5)} + 13\sum_{k=1}^{k=12} \ {(k)}\\\\=13*5+13*\dfrac{12*13}{2}\\\\=65+13*13*6\\\\=65+1014\\\\=1079$

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Lostsunrise [7]

Answer:

Step-by-step explanation:

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Step-by-step explanation:

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2 years ago

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