Geometric series/sequences question (from Cambridge entrance exam)

[arshakshahr]

 

[Dr.Peterson]

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[onesun0000]

You might wanna show us your solution first and explain where you got stuck...

 

[skeeter]

for geometric progression [MATH]s_n[/MATH]
[MATH]\dfrac{s_1}{1-r_s} = 25[/MATH] and [MATH]s_1 \cdot r_s = 6[/MATH]
two equations & two unknowns ... see what you can do

 

[chinachin]

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