1.

If sum_(r=1)^n I(r)=(3^n -1) , then sum_(r=1)^n 1/(I(r)) is equal to :

Answer»

`2(1-(1/3)^N)`
`(1-(1/3)^n)`
`3/4(1-(1/3)^n)`
`4/3(1-(1/3)^n)`

ANSWER :C


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