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You are given an array of positive integers. Find the GCD(Greatest Common Divisor) of a pair of elements such that it is maximum among all possible pairs. GCD(a, b) is the maximum number x such that both a and b are divisible by x.

```
For example:
If the given array is {1, 5, 2, 3, 4}, the output will be 2 (which is GCD of 2 and 4, all other pairs have a GCD of 1)
```

Detailed explanation

```
1 <= T <= 10
2 <= N <= 10 ^ 4
1 <= ARR[i] <= 10 ^ 5
Where 'T' is the number of test cases, 'N' is the size of the array and ARR[i] is the ith element in the array.
Time Limit: 1 sec.
```

```
3
5
5 2 4 3 1
5
2 4 6 5 6
10
4 2 10 8 6 4 3 2 1 7
```

```
2
6
4
```

```
In the 1st test case, pair (2,4) has a maximum GCD value of 2, all other pairs have a GCD of 1.
In the 2nd test case, pair (6,6) has a maximum GCD value of 6, all other pairs have GCD less than 6.
In the 3rd test case, pair (4,8) has a maximum GCD value of 4, all other pairs have GCD less than 4.
```

```
2
4
2 4 6 8
5
1 2 3 4 5
```

```
4
2
```