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anonymous
 4 years ago
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.
anonymous
 4 years ago
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.

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0it is coming r^(n1)=64

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0then i used the sum formula Sn=\[Sn =\frac{ a[r^n1) }{ r1 }\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0exactly...now you got two equations in two unknowns...so solve for r and n

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0where??tell me the second one

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[127=\frac{ r^n1 }{ r1 }\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0r comes out to be 2.isn't it??

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0The answer should come r=2 and n=7

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0yeah hold on lemme write

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1356937412146:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0^from here you can get r=2....then put r=2 in first equation to get n
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