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koli123able
Group Title
In a G.P. , the first term is 7, the last term is 448, and the sum is 889. Find the common ratio and the number of terms.
 one year ago
 one year ago
koli123able Group Title
In a G.P. , the first term is 7, the last term is 448, and the sum is 889. Find the common ratio and the number of terms.
 one year ago
 one year ago

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stgreen Group TitleBest ResponseYou've already chosen the best response.3
use an=a1*r^(n1)
 one year ago

stgreen Group TitleBest ResponseYou've already chosen the best response.3
where an=48 and a1=7
 one year ago

koli123able Group TitleBest ResponseYou've already chosen the best response.0
it is coming r^(n1)=64
 one year ago

koli123able Group TitleBest ResponseYou've already chosen the best response.0
then i used the sum formula Sn=\[Sn =\frac{ a[r^n1) }{ r1 }\]
 one year ago

stgreen Group TitleBest ResponseYou've already chosen the best response.3
exactly...now you got two equations in two unknowns...so solve for r and n
 one year ago

koli123able Group TitleBest ResponseYou've already chosen the best response.0
i am stuck here
 one year ago

stgreen Group TitleBest ResponseYou've already chosen the best response.3
where??tell me the second one
 one year ago

koli123able Group TitleBest ResponseYou've already chosen the best response.0
\[127=\frac{ r^n1 }{ r1 }\]
 one year ago

stgreen Group TitleBest ResponseYou've already chosen the best response.3
r comes out to be 2.isn't it??
 one year ago

koli123able Group TitleBest ResponseYou've already chosen the best response.0
The answer should come r=2 and n=7
 one year ago

stgreen Group TitleBest ResponseYou've already chosen the best response.3
yeah hold on lemme write
 one year ago

stgreen Group TitleBest ResponseYou've already chosen the best response.3
dw:1356937412146:dw
 one year ago

stgreen Group TitleBest ResponseYou've already chosen the best response.3
^from here you can get r=2....then put r=2 in first equation to get n
 one year ago
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