Answer :

As the three resistors are in parallel combination to each other , so , let the total resistance of the 3 resistors be R_{3} and the total resistance of the two resistors be R_{2} ,

Let the three resistors be R_{a} , R_{b} , R_{c} .

First we will calculate the total resistance of 3 resistors,

We are given with the values of R_{3} = 60/47 ohm and R_{2} = 15/8 ohms ,

When one wire is broken down , let the wire be of resistance R_{a} , so

Put the value of two resistor equation in three resistor equation ,

We get ,

Hence this is the required resistance.

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