Mathematics

Francisco Adkins

11 February, 16:05

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