Question 447635
a)
9+6+4+ 8/3 = 65'/3 Easier than using the formula S[n}=a[1]((1-r^n)/(1-r)) where r=2/3, n=4, a[1]=9
.
b)
S=a[1]/(1-r)=9/(1-(2/3))
=9/(1/3)
=27'
.
Ed