add week three questions

Week 2.md

-## Week 1
+## Week 2
 ### Problem 1
 
 Write a Java program to insert an element (specific index and value) into an array. Shifting the rest of the elements to the right
 Index : 2
 Value : 5
 Original Array : [25, 14, 56, 15, 36, 56, 77, 18, 29, 49]                                                     
-New Array: [25, 14, 5, 56, 15, 36, 56, 77, 18, 29] 
+New Array: [25, 14, 5, 56, 15, 36, 56, 77, 18, 29]
 ```
 
 ### Problem 2
 ```
 Index : 1
 Original Array : [25, 14, 56, 15, 36, 56, 77, 18, 29, 49]                                                     
-After removing the second element: [25, 56, 15, 36, 56, 77, 18, 29, 49, 49] 
+After removing the second element: [25, 56, 15, 36, 56, 77, 18, 29, 49, 49]
 
 ```

Week 3.md

+## Week 3
+### Problem 1
+
+Write a Java program to find the maximum and minimum value of an array.
+
+```
+Original Array: [25, 14, 56, 15, 36, 56, 77, 18, 29, 49]
+Maximum value for the above array = 77
+Minimum value for the above array = 14
+```
+
+### Problem 2
+
+Write a Java program to find the duplicate values of an array of integer values.
+
+Input:
+```
+Input Array : [1, 2, 5, 5, 6, 6, 7, 2]
+```
+Output:
+```
+Duplicate Element : 2
+Duplicate Element : 5
+Duplicate Element : 6
+```