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Mathematics 11 Online
OpenStudy (anonymous):

Write the sum using summation notation, assuming the suggested pattern continues. 5 - 15 + 45 - 135 + ...

OpenStudy (akashdeepdeb):

Sum of the GP where a = 5, r = -3! a(1 - r^n)/(1-r) right?

OpenStudy (anonymous):

right. 5(1+3^n)/(1+3)

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