15.7  What does the following code do?
1 public int mystery(int a, int b) 2 { 3 if (b == 1) 4 return a; 5 else 6 return a + mystery(a, b  1); 7 } // end method mystery 
15.8  Find the error(s) in the following recursive method, and explain how to correct it (them). This method should find the sum of the values from 0 to n.
1 public int sum(int n) 2 { 3 if ( n == 0 ) 4 return 0; 5 else 6 return n + sum( n ); 7 } // end method sum 
15.9  (Recursive power Method) Write a recursive method power(base, exponent) that, when called, returns
For example, power(3,4) = 3 ^{*} 3 ^{*} 3 ^{*} 3. Assume that exponent is an integer greater than or equal to 1. [Hint: The recursion step should use the relationship

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