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When three resistances r1, r2 and r3 are...

When three resistances `r_1, r_2` and `r_3` are connected in series, then combined resistance 'R' is equal to :

A

`1/R = 1/(r_1) + 1/(r_2) + 1/(r_3)`

B

`R= r_1 + r_2 + r_3`

C

Both (A) and (B)

D

None of these

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