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Step 1 :

n^th term of a geometric sequence :

The n^th term of a geometric sequence is .

Where is the first term and r  is the common ratio.

Step 2 :

The sequence is

The first term is .

The second term is .

The common ratio is .

Substitute and in above equation.

The common ratio is .

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Step 3 :

The n^th term of a geometric sequence is

Substitute and in above equation.

The n^th term of a geometric sequence is .

Solution : 

The n^th term of a geometric sequence is .