5P4 where P is the permutation operator = 5!/(5-4)! = 5! = 5 x 4 x 3 x 2 x 1 = 120.
56305
Five numbers (5, 6, 7, 8, 9) can be selected for each of the 5 digits. So, there are 5*5*5*5*5 or 55 or 3125 five digit numbers.
It is .56789
56789
Rounding numbers is easy if it 1234 we can put 0 andnif 56789 we get it 10
98765- 56789 = 41976
100 -56789 = -56689
23456-56789 = -33333
250897 - 56789 = 194108
7 + 56789 = 56796
All but 56789 are.
All but 56789 are.
56789