Two events that cannot happen at the same time are said to be mutually exclusive.
Now, let's suppose that we are choosing from the following numbers.
Recall that natural numbers form a subset of complex numbers. Notice that the first number 1+0* i is a complex number and also a natural number because 1+0* i=1, which is a natural number. Therefore, if we choose the first number we will choose a complex number and a natural number.
This means that the events of choosing a complex number and choosing a natural number can happen at the same time. Thus, the events are not mutually exclusive.
