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Two unknown resistrance X and Y are conn...

Two unknown resistrance X and Y are connected to left and right gaps of a meter bridge and the balancing point is obtained at 80 cm from left. When a 10Ω resistance is connected in parallel to x, the balance point is 50 cm from left. The values of X and Y respectively are

A

40Ω , 9Ω

B

30Ω , 7.5Ω

C

20Ω , 6Ω

D

10Ω , 3Ω

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