# Finding greatest product pairs

## Question

Suppose you're given an array of `n`

elements. Within this array, return the greatest value of a single element that is the product of two elements contained within the same array. If no such product exists, print `N/A`

. Lastly, you can assume that the values within the array are positive integers.

For example:

```
Input: array = [2, 2, 4, 5, 9]
Output: 4 #(since 2 * 2 = 4)
Input: array = [1, 3, 4, 7, 10]
Output: 10 #(since 1 * 10 = 10)
Input: array = [3, 3, 4, 7, 10]
Output: N/A
```