Answer:
7
Explanation:
48 is divisible by all those numbers to get a whole number except 7. See, if you divide 48 by 3 you get 16. That means if you divide 48 by 16 you get 3. That automatically gets rid of those two numbers.
Now, 48 divided by 48 is 1. All that's left is 7, if you try to divide 48 by 7 you get a really long decimal instead of a whole number.
If you need me to explain it more, let me know! Hope this helps, and have a great day!