Please solve it properly and explain.

Mode Delay 3. /10 pts): Consider the following grammar: = empty string = Al B = $ i I Write pseudocode for a recursive method that returns true if a string in in this language and returns false otherwise. 4. /10 pts]: Consider an ADT list of integers. Write a method that Computes the sum of the integers in the list aList. // Precondition: aList is a list of integers. Postcondition: The sum of the integers in aList is returned