निम्न गुणोत्तर श्रेढ़ी (G.P.) का योगफल ज्ञात कीजिए। 

4/5, 4/25, 4/125, 4/625, ... n पदों तक 

1
2/5(1-(1/5n)) 
2
5/4(1-(1/5n))
3
(1-(1/5n))
4
4/5(1-(1/5n)) 

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