Question 1081427
an=a1*r^(n-1)
6=a1*r; r=6/a1
24=a1*r^3
substitute
24=a1*216/a1^3=216/a1^2
a1^2=216/24=9
a1=3
r=2
The first four terms are 3,6,12, and 24.