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Both 3 and 5 are prime numbers. 3 x 5 = 15
The prime factors of 60 are 2, 2, 3, and 5.The prime factors of 105 are 3, 5, and 7.The prime numbers that are factors of both 60 and 105 are 3 and 5.
5 = 2+3 = 7-2
5 and 7 are both prime numbers.
The prime numbers of 100 are: 2, 2, 5 and 5