1 × (3 + 5 + 7 + 9 + 11 + 13 - 15 + 17) = 50.
yes
93876
Without repeating, 4. With repeating, 8.
5040
The number is 9875.
24
4 x 3 x 2 ie 24
9875
24, and the word is digit, not diget!
10234 If you're cheap, you can go 01234
4p3*3p1 equal to 72 ways
7, 42, 63, 98, 105
10 000 if you can start with zero.