When the numbers end with an odd number they're divisible mostly by odd numbers.
When the numbers end with an even number they're divisible by even numbers. In the case of number 1, where the number 84 is divisible by an odd number 7, if two numbers consist of an even and odd number they can be divisible also by odd number...7 when multiplied to a number has a product that ends with an even number cite for example 7 x2 is 14.
When the numbers end with a zero, they're divisible mostly by even numbers. In the case of number 3 where 2000 is divisible by an odd number which is 5, take note that 5 has a number that when you multiplied results to a product that ends with 0.
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