in a 9 digit integer, each of the digits 1,2,3,4,5,6,7,8,and 9 appears exactly once. Find the probability that the integer is divisible by 9.
the probablility is 1.00 ; if the digits add to something divisible by 9, it is divisible by nine. 1,2,3,4,5,6,7,8,9 add to 45.
