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= 20 ohm
R.seri 2 = 10 + 20 ohm
= 30 ohm
R.seri 3 = 60 ohm
R.paralel =
1/Rp = 1/20 + 1/30 + 1/60
= 3/60 + 2/60 + 1/60
= 6/60
1/Rp = 6/60
(kali silang)
6Rp = 60 × 1
R.p = 60 ÷6
= 10
rangkaian seri (akhir) / ekivalen
= 40 ohm + 10 ohm + 50 ohm
= 100 ohm
jadi, jawabannya C.
*insyaAllah bener.
:)