Is it never always or sometimes the sum of two positive integers is zero?
The sum of two positive integers is never zero.
The sum of two numbers a and b can only be zero if a=-b, or a=0
and b=0. Since 0 is not a positive integer, and a and b cannot both
be positive integers if a=-b, then it is impossible for the sum of
two positive integers to be zero.
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The above answer is correct. Here is another way to say it:
An integer is any whole number including negative numbers,
positive numbers and zero.
However, a "positive integer" is a whole number greater than
zero. The "sum of two positive integers" means you are adding two
numbers greater than zero together. Therefore, the sum of two
positive integers can never be a negative integer, and can never be
zero.
Example: 1 + 1 = 2