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2 14 2 21 7 7
^ ^
2 7 3 7
KPK=2 pangkat 2 dikali 3 dikali 7 pangkat 2=4 kali 3 kali 49=588
FPB=7
28 = 2² x 7
42 = 2x3x7
49 = 7²
kpk = 2² x 7² = 196
fpb = 7