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Question 51. what is the problem with the following code describe it. package edu.saintpaul.wk7.examples.midexam; public class AddMe { static int num = 0; public static int calc(int x) { num = num + 1; System.out.println(nchen); // add code here return num + calc(num + 1); } public static void main(String[] args) { AddMe.calc (num); } } Write a recursive method that counts the number of nodes in a chain of linked nodes. /** Recursively counts the nodes in a chain. @param start the first node. @returns The number of nodes in the linked chain. */ public int countNodes(Node start) { // complete the code here }