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use the same formula as in part a)

we need to find n.
r=2/3. how about a1?

a1=2m

ohh yes

but..

whats the problem?

(2/3)^n = 3/25 ?

then use log

...wait

5.23??

5.8 = {2(1-(2/3)^n)}/(1-(2/3))

did u solve for n?

n=5.23??

\[2(\frac{ 1-(\frac{ 2 }{ 3 } )^{n}}{ 1-(\frac{ 2 }{ 3 }) })=5.28\]

no...... it is 5.8

yaya, typing mistake

u used 5.28

I got 8.39

8.388

got it now, thanks

welcome