Verified Answer :

dalendrk

\(S_n=\dfrac{a_1(1-r^n)}{1-r}\\\\S_n=48455;\ r=3.2;\ n=3\\\\subtitute\\\\\dfrac{a_1(1-3.2^3)}{1-3.2}=48455\\\\\dfrac{a_1(1-32.768)}{-2.2}=48455\\\\\dfrac{-31.768a_1}{-2.2}=48455\\\\14.44a_1=48455\ \ \ \ |divide\ both\ sides\ by\ 14.44\\\\a_1\approx3355.61\)

Sn = a1 ( 1 - r^n) / (1 - r) 
 a1=Sn(1-r) / (1 - r^n) 
by putting values we get
a1 = 48455(-2.2) / (1 - (3.2^5) )
a1 = (-106601) / (-31.768) 
a1 = 3355.609418 
a1=3356
hope this helps

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