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Another way to explain it is consider the prime factorization of both numbers. The product will contain all of the prime factors from both, so if there is at le
by inimino 5y ago
Another way to explain it is consider the prime factorization of both numbers. The product will contain all of the prime factors from both, so if there is at least one 2 and at least one 5 in then the result will be divisible by 10.