गुणोत्तर श्रेढीची बेरीज शोधा:

1/3, 1/ 9, 1/27, 1/81, … ते n पदं.

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

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