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(Q1).Find the 20^th and n^th term of the GP
5

2
,
5

4
,
5

8
......

Here a =

and r=

=

Then a₂₀ = a.r^20-1 =

(

)¹⁹ =

²⁰

and a_n = a.r^n-1 =

(

)^n-1 =

ⁿ