Question

Find an explicit formula for the geometric sequence b(n)= 2,6,18,54,...

Answer 1

a = 2

r = 3

an = a x r^n-1

a5 = 2 x 3^4

= 162

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Answer 2

Answer:

3^（n-1）*2

Step-by-step explanation:

n=1,2=3^0*2=1*2=2

n=2,6=3^1*2=3*2=6

n=3,18=3^2*2=9*2=18

n=4,54=3^3*2=27*2=54