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tapi kan s' blm tau jadi cari dulu
1/f = 1/s'+1/so
1/15 = 1/s' + 1/ 20
1/s' = 1/15-1/20
1/s' = 1/60 = 60/1 = 60
terus cari M nya
M= s'/so
M=60/20
M= 3
jawabannya yang B