please answer this question below, I really need help.

Exercise 2 Consider the following code: void main(int argc, char **argv) { spawn (4); } // spawn procedure void spawn(int number) { if (number > 0) { fork(); spawn (number-1); } } Discuss how many processes (including the parent) are created when this code is run. Hint: obtain a recursive expression for the number of processes created by spawn(). Depict the parent-child hierarchy of processes using a tree