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A(r raised to the power n-1)=3. here a=3.a(r raised to the power n-1)=81.we know that a=3.so(r raised to the power n-1)=81/3=27.27 can be written as 3 raised to the power 3.that is r=3 and n-1=3.if n-1=3 then n=3+1=4.geometric progression is 3,9,27,81.that a,a(r raised to the power 2-1),a(r raised to the power 3-1),a (r raised to the power 4-1).
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