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OpenStudy (anonymous):
Write the sum using summation notation, assuming the suggested pattern continues. 5 - 15 + 45 - 135 + ...
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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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