There are 18 girls and 12 boys on the swim team. what percentage of the team is made up of girls

Which of the following exceptions could occur when the following code is run, if the precondition is met? // precondition: a is not null public string dosomething(arraylist a, int b) { int i; string s; for (i = 0; i < = a. size(); i++) { s = (string)(a. get(i)); if (s. length() == b) { return s; } } return null; }