Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases are 9 ohm and 2 ohm respectively. Then the resistances of the component resistors are 

(1) 2 ohm and 7 ohm

(2) 3 ohm and 6 ohm

(3) 3 ohm and 9 ohm

(4) 5 ohm and 4 ohm

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