no 20 tolong yang bisa

1/Rp=1/6+1/12+1/4
=2+1+3/12
=6/12
Rp=12/6
=2ohm
R1=2ohm+3ohm
=5ohm
I=E/R+r
=12v/5ohm+1ohm
=12/6
=2 A