Solution)
Here, 1.8 ohms, 4.1 ohms and 3 ohms are in series
So, Req= 1.8+4.1+3= 8.9 ohms
Now, the combination of 8.9 ohms is in parallel with 3.7 ohms
So, Req= 8.9*3.7/(8.9+3.7) = 2.61 ohms
Now, 2.6 ohms in series with 6.5 ohms
So, Req= 2.6 + 6.5= 9.11 ohms
Now, 9.11 ohms in parallel with 3.9 ohms
So, Req= 9.11*3.9/(9.11+3.9)= 2.73 ohms
Now, 2.73 ohms in series with 2.9 ohms
So, Req= 2.73+2.9 = 5.63 ohms (Ans)
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Good luck!:)
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