Assuming the recursive definition is tn = 2*tn-1
t1 = 3
t2 = 2*t1 = 2*3 = 6
t3 = 2*t2 = 2*6 = 12
t4 = 2*t3 = 2*12 = 24
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A descending geometric sequence is a sequence in which the ratio between successive terms is a positive constant which is less than 1.
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2
Ratio