Missing element of AP
Submissions: 8188   Accuracy:

37.45%

  Difficulty: Easy   Marks: 2

Find the missing element from  an ordered array A[ ], consisting of N elements representing an Arithmetic Progression (AP) .
 

Input:
The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. 
The first line of each test case contains an integer N, where N is the size of the array A[ ].
The second line of each test case contains N space separated integers of an Arithmetic Progression denoting elements of the array A[ ].

 

Note: The series should have a missing element in between a perfect A.P. with no missing element will not be considered.
 

Output:
Print out the missing element. 

 

Constraints:
1 <= T <= 100
2 <= N <= 10
-50 <= A[i] <=50

 

Examples :

Input:
3

2 10 14 

-28 -21 -7 0 

9 12 15 21 24

Output : 
6
-14
18

** For More Input/Output Examples Use 'Expected Output' option **

Author: Rohan Malhotra


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