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marusya05 [52]
3 years ago
6

Find S25 for (-7) + (-2) + 3 + 8 +...

Mathematics
1 answer:
elena-14-01-66 [18.8K]3 years ago
3 0
a_1=-7 \\ a_2=-2 \\  \\ d=a_2-a_1=-2-(-7)=5 \\  \\  \\ S_{25}= \cfrac{2(-7)+(25-1)5}{2}\cdot25 = \cfrac{-14+120}{2}\cdot25 =\cfrac{106}{2}\cdot25 =1325

Your answer is B. 1325
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