Which formula can be used to find the nth term in a geometric sequence where a1=3 and r=2?
a) an=3+2 (n-1)
b) an=3 (n-1) + 2
c) an=3^n-1•2
d) an=3•2^n-1
A sequence is defined by an = - 3/4•an-1 and a3=9/16• What is the seventh term?
a) - 225/256
b) - 27/64
c) 59,049/1,048,576
d) 729 / 4,096
What is the common ratio of the geometric sequence below?
625, 125, 25, 5, 1, ...
a) 1/625
b) 25/125
c) 625/124
d) 125/5
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