The inverse of F(x) is a function

Step-by-step explanation:

Let f be a function having domain in the set X, and range in the set Y. Then f would be invertible if there exists a function g having domain Y and range X, such as:

In other words, the function is applied to an input x, and gives an outcome of y, then its inverse function, let say , can be applied to y to give the result of x.

In other words,

y = f(x) if and only if x = g(y)

For example, considering the function

the inverse is:

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.