Calculate the equivalent resistance of four resistors R1=100 ohms , R2=250 ohms , R3=350 ohms and R4=200 ohms such that R1 and R2 in parallel will be connected in series with R3 and R4 in parallel. O A. 20 ohms O B. 400 ohms O C. 198.7 ohms O D. 179.8 ohms

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