3 years ago

Write the sum using summation notation, assuming the suggested pattern continues. -9 - 3 + 3 + 9 + ... + 81

Mathematics

1 answer:

Genrish500 [490]3 years ago

4 0

-9 -3 +3 +9 +15 +....+81=15+21+...+81=(23*66)/2=759

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