Arithmetic Sequence

kaidenh2016 on September 24, 2018

Sequence: -13 -10 -7 – ….. +62 Determine the sum of the arithmetic sequence

62 = -13 + (n-1) (3)

+13 +13 —–> 75 = (n-1) (3) —–> $\frac{75}{3}$ = (n-1) ( $\frac{3}{3}$ ) ——-> 25=n-1 = n = 26

/prt 2 $S_{26}$ = $\frac{26}{2}$ (-13+62) —–> $S_{26}$ = 13 (49) —-> $S_{26}$ = 637

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