Asked by david

what is the sum of geometric infinite series 3/2+ 9/16+ 27/128+ 81/1024=....

i know the formula is S=a/(1-r)

my teacher, he usually transforms into a formula of the sum series and finds out a and r.but i don't how to do that.

the pattern i saw is 3/2 + 3^2/2^4 + 3^3/2^7+ 3^4/2^10+....

a= 3/2 r= 3/8

3/2 + 3/2*3/8 + 3/2*3/8*3/8 + ....
Answered by Anonymous
The answer is 2.40. I don't how to do it but I had that question on a quiz, so i know that the answer is right.
Answered by khadija
2/3-1/3+1/6
Answered by shicky
6+10+14+...+86 sum
Answered by Super credible
Basically, the ratio (r) is 3/8 (which you can get by dividing the second given term by the first) and because the first term is 3/2, the constant must be 4 to simplify the 8. Hope that helps! :)
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