1. Consider the following recursive function: def foo(n):    if (n == 0):       return 0    return n + foo(n - 1) a. What is foo(5)   b. What is foo(10)   c.  Suppose that n + foo(n - 1) is changed to n * foo(n - 1). What is foo(5) now?   d. What happens if foo(-1) is called?

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