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2 63
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7 9
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3 3
147
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3 49
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7 7
FPB=Faktor Persekuan Besar
126 dan 147
126=2x7x3x3 / 2x7x3²
147=3x7x7 / 3x7²
hanya yang sama jadi
hanya 7 dan 3
lalu dikali 7x3=21
FPB=21