a3= a1(r^n-1)
4/3= 3(r^3-1)
4/9= r²
2/3= r
a5= 3(2/3^5-1)
a5= 3(16/81)
a5= 48/81 or 16/27
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a3= a1(r^n-1)
4/3= 3(r^3-1)
4/9= r²
2/3= r
a5= 3(2/3^5-1)
a5= 3(16/81)
a5= 48/81 or 16/27