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use an=a1*r^(n-1)

where an=48 and a1=7

*448

it is coming r^(n-1)=64

then i used the sum formula Sn=\[Sn =\frac{ a[r^n-1) }{ r-1 }\]

exactly...now you got two equations in two unknowns...so solve for r and n

i am stuck here

where??tell me the second one

\[127=\frac{ r^n-1 }{ r-1 }\]

r comes out to be 2.isn't it??

The answer should come r=2 and n=7

yeah hold on lemme write

ok

|dw:1356937412146:dw|

^from here you can get r=2....then put r=2 in first equation to get n

got it??

yes

good