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Verified answer
1) 36 = 2² × 3²38 = 2 × 19
fpb = 2
2) 40 = 2³ × 5
42 = 2 × 3 × 7
fpb = 2
3) 46 = 2 × 23
49 = 7²
fpb = -
4) 52 = 2² × 13
54 = 2 × 3 × 7
fpb = 2