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Berarti
ΣF = 0
kelembaman
Jadi, di sana
Opsi A -> ΣF = 4N
Opsi B -> ΣF = 0
Opsi C -> ΣF =6 N
Opsi D -> ΣF = 12 N
Jadi, disini yang ΣF = 0 adalah Opsi B