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19 is a prime number and has no factors other than itself and 1. The factors of 10 are 2 and 5.
The greatest common factor (GCF) of 20, 30, and 50 is 10. To find the GCF, you need to determine the largest number that divides evenly into all three numbers. In this case, 10 is the largest number that is a factor of 20, 30, and 50. This can be calculated by finding the prime factors of each number and identifying the common factors among them.
The idea is to sort the numbers, from smallest to largest, then pick the number in the middle.