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1 + (-1) = 0

N + ( -N) = 0

Which means we can all add all the finite numbers it will result to zero ..

Same way

2 * 1/2 = 1

N* 1/N = 1

So if you multiply all the finite numbers ..you will get 1 ..

In multiplication we are in the integers in the finite field so 1/N isn’t an option - but we can multiply 2 numbers to get 1

Eg in mod(5) 2 * 3 = 1 so 3 is the inverse of 2

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