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List the first four terms of a geometric sequence with t1 = 4 and tn = -3tn-1.
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t2 = -3*t1 t1 = 4 so t2 = -3*4 t2 =-12 t3 = -3 * t2 t3 = 36 t4 = -3*t3 t4 = -108 so the first 4 terms are 4, -12, 36, and -108
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