If the 3

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

Correct result:

r =  0.3333

Solution:

a6=4 a10=481=481≐0.0494  a10=a6⋅ r10−6  r=a10/a64=0.0494/44=13=0.3333

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