943
99997
772
99997
It is 963.
the largest five digit number that can be formed using the digits 7 and 9 is 97,000
Pressumably, you want to use each digit once. Starting from the left, use the largest digit you can every time. For example, the left-most digit should be "6".
651
985
The smallest number is 5,789. The largest is 98,750. The difference is 92,961.
9876543210, without using any mathemeatical operations.
You get the largest number if you sort the digits, from largest to smallest.
I think the answer is: 976542