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25-1=24 24-2=22 22-3=19 19-4=15 15-5=10 The next number in the series is 10.
Factors of 15: 1 3 5 15 Factors of 24: 1 2 3 4 6 8 12 24 The highest common factor of 15 and 24 is 3
The Highest Common Factor (HCF) of 15 and 24 is 3. To find the HCF, you can list the factors of each number and identify the largest factor they have in common. The factors of 15 are 1, 3, 5, and 15. The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24. The largest factor they have in common is 3, making it the HCF.
The GCF is 1.
The GCF is 3.