Answer:
2.5 ohm
Step-by-step explanation:
R' and R''' are parallel
So,
1/R1= 1/R' + 1/R'''
1/R1 = 1/2 + 1/2
1/R1 = 1
so,
R1= 1 ohm
Now R1 and R'' are in series
R= R1 + R''
R= 1 + 1.5
R= 2.5 ohm
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