obtain the number of terms in the following geometric progression

81, 27 , 9 , 1/243

can i find the number of terms using this

the answer that i get is a fraction though and that couldnt be possibly correct

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- Dec 8th 2010, 10:20 AMsigma1number of terms in geometric progression
obtain the number of terms in the following geometric progression

81, 27 , 9 , 1/243

can i find the number of terms using this

the answer that i get is a fraction though and that couldnt be possibly correct - Dec 8th 2010, 11:24 AMemakarov
I suppose there are some skipped terms between 9 and 1/243.

So and . The equation is . From here, , or , so n = 10. - Dec 8th 2010, 11:43 AMSoroban
Hello, sigma1!

Quote:

. . . .

This geometric progression has: .

So we have: .

We want: .

. .

Therefore, there areterms in the progression.*ten*

- Dec 8th 2010, 12:52 PMsigma1
- Dec 8th 2010, 01:55 PMemakarov