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R2, R3 in parallel form so 1/R= 1/30+1/60 then 1/R=2+1/60, R=60/3, R=20ohm, R4,R5 in series combination so 3+2=5 ohm, and this 5ohm and 20 ohm in parallel combination so 1/R• = 1/20+1/5, 1/R•=1+4/20, R•= 20/5, R•=4ohm and This R• and R1 in series combination so Req= 2+4 =6 ohm and V=i×Req, 15/6=current, 5/2 A is correct
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