Adding or subtracting zero cant, multiplying or dividing by zero can.
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It is zero.
No, the product is, but not the sum. 0 + 2 = 2
Zero is useful because if we did not have the number zero then if we did the sum 7-7 then there would be no answer because the answer is zero, zero replaces and odd bits in a sum or something......
This sum is zero, neutral.
The sum of two positive integers can never equal zero.