Which equation could be used to calculate the sum of the geometric series? 1/3 + 2/9 + 4/27 + 8/81 + 16/243?

  = a() when r1

and   =   when r1

Explanation:

where a is first term of geometric series

r = common ratio of geometric series

n= number of terms of geometric series

In the given series a=  

r=

n=5

So, substituting the values in the equation for r1

you will get the required result

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