Geometric progression

If the 6th term of a GP is four and the 10th is 4/81, find common ratio r.

Correct answer:

r =  0.3333

Step-by-step explanation:

a6=4 a10=8140.0494  a10 = a6   r 106  r=4a10/a6=40.0494/4=31=0.3333

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