20 = 2² × 5
72 = 2³ × 3²
52 = 2² × 13
→ 2³ × 3² × 5 × 13
→ Opsi C
21 = 3 × 7
126 = 2 × 3² × 7
42 = 2 × 3 × 7
→ 3 × 7
→ 21
→ Opsi B
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Soal pertama
20 = 2² × 5
72 = 2³ × 3²
52 = 2² × 13
→ 2³ × 3² × 5 × 13
→ Opsi C
Soal Kedua
21 = 3 × 7
126 = 2 × 3² × 7
42 = 2 × 3 × 7
→ 3 × 7
→ 21
→ Opsi B