Answer :

To make equivalent resistance of 250 ohms one may connect:

1) 2 resistors in series Thus, the resultant would be:

100+100= 200 ohms

2) 2 resistors in parallel Thus, the resultant of 2 parallel combination would be:

3) Now connect the combination of the two (series and parallel) in series: Thus, we may obtain a net resistance of: 200+50 = 250 ohms

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