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168 = 2^3 * 3 * 7
FPB = 2^3 * 7
FPB = 56
/\ /\
2 28 2 84
/\ /\
2 14 2 42
/\ /\
2 7 2 21
/\
3 7
56 = 2³ × 7
168 = 2³ × 3 × 7
FPB = 2³ × 7 = 2 × 2 × 2 × 7 = 56