Find the sum of each of these arithmetic series. a. 5 + 12 + 19 + (17

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Find the sum of each of these arithmetic series.
a. 5 + 12 + 19 +… (17 terms) 

b. 4 + 1 + (−2) +… (38 terms)

c.

d. −x − 5x − 9x −… (40 terms)

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