– [ FPB ( 20 & 35 ) ] – [ FPB ( 40 & 38 ) ]

FBP 20 = 2 pangkat 2 × 5
FBP 35 = 5 × 7
FPB 40 = 2 pangkat 3 × 5
FPB 38 = 2 × 19

maaf kalau salah