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01-01-2018
Mathematics

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Аноним Аноним

01-01-2018

fifth term / second term = a1r^4 / a1r = r^3 = 768 / -12 = -64

so r = -4 and first term a1 = -12/-4 = 3

answer is 3*(-4)^(n-1)

Its C

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