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f = 20/30
f benda A =2/3
Frekuensi benda B
f = n/t
f = 25/45
f = 5/9
jadi f.a : f.b
=2/3 : 5/9
= 6/5
fA : fB = 20/30 : 25/45
fA : fB = 2/3 x 9/5
fA : fB = 6/5
frekeunsi A banding frekuensi B adalah 6 : 5