1. Given the following method in Java:

int mystery(int num){
	int sum = 0;

	for( int i = 0; i < num; i = i+3){
		sum += i;
	}

	return sum;
}

What would the following calls return:
a. mystery(10)
b. mystery(3)
c. mystery(12)

(For those curious, "i = i+3" could also be written as "i += 3".

2. The following function is supposed to figure out the sum of the lengths of two input strings.
Unfortunately, the function has three syntactic errors.  Identify and fix them.

boolean stringLengths(String s1, String s2){
	sum = 0;
	sum = s1.length() + s2.length()
	return sum;
}