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 ..
Discussion
All unique numbers ..of course ..
And you can't have zero in the operation under multiplication..cuz then it is anyway all zero
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