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Three resistors having resistance r1, r2...

Three resistors having resistance `r_1`, `r_2`, `r_3` are connected as shown. The ratio `i_3/i_1` of current in terms of resistance used in circuit is

A

`r_1/(r_1 + r_2)`

B

`r_2/(r_1 + r_3)`

C

`r_1/(r_2 + r_3)`

D

`r_2/(r_2 + r_3)`

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