Answer: 3
Explanation:
Factor of 15: ±1, ±3, ±5, ±15Factor of 18: ±1, ±2, ±3, ±6, ±9, ±18Factor of -45: ±1, ±3, ±5, ±9, ±45=> GCF of 15, 18, -45 is 3
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