Rotate Array
You are given an array of N length. You have to rotate the array right...
Max. Marks: 6
Solved By : 1410
Floating Number
Bob has a floating point number N. He wants to set the precision for 2...
Max. Marks: 4
Solved By : 4909
SwapMaster solves Symmetric Swap
The SwapMaster is known to be the greatest and fastest swapper of all ...
Max. Marks: 4
Solved By : 4124
String Matching
Cody has a sequence of characters N. He likes a sequence if it contain...
Max. Marks: 3
Solved By : 2275
Leap Year
Steve is playing a quiz game with his brother John. As Steve just lear...
Max. Marks: 6
Solved By : 3533
Project Teams
There are N students in a class and Teacher want to divide these stude...
Max. Marks: 5
Solved By : 4255
Circle of Numbers
All numbers in NumberLand are standing in a circle for a dancing cerem...
Max. Marks: 6
Solved By : 2936
Happy String
A happy string is a string in which each character is lexicographicall...
Max. Marks: 4
Solved By : 2202
Degree Celsius
Tom is a scientist. He uses huge machines for complex calculations. Th...
Max. Marks: 4
Solved By : 4970
Three's Company
This problem requires you to create a output string from input string ...
Max. Marks: 4
Solved By : 3261
Arithmetic Sequence
Please select a challenge
Problem Statement
In mathematics, an arithmetic progression (AP) or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant. John was writing an Arithmetic sequence with N terms, but while writing he mistakenly made one wrong entry and he is sure that first term is right. Help him to find the wrong term entered by him.

The first line of input contains a single line T, which represents the number of testcases. Then first line of each test case contains an integer N :Total number of terms. Then N space separated integers denoting the sequence.

For each test case. Print the wrongly entered term.

1<=T<=100. 4<=N<=1000. 1<=Terms<=1000.

Sample Input
1 3 5 6 9
1 2 3 5

Sample Output


Dcoded By: Bhanu Nadar

Solved By: 531

Maximum Marks: 6