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Mathematics 7 Online
OpenStudy (anonymous):

an = a1 – 4(n – 1), a1 = 8 an = a1 * (1/2)(n-1), a1 = 8 an = a1 + 4(n – 1), a1 = 8 an = a1 * 2(n-1), a1 = 8

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