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Un = ar^n-1
Un = 1 x (-3)^n-1
Un = -3^n-1
c. a= 2, r= 6/2 = 3
Un = ar^n-1
Un = 2 x 3^n-1
531.441 = -3^n
n = 12
1.458 = 2 x 3^n
n = 6