If six numbers are randomly selected without replacement from set {1, 2, 3, 4, 5, 6}, what is the probability that the numbers are selected in ascending order?  Choose the correct choice from the following options.
A) 1/280
B) 1/640
C) 1/720
D) 1/240
E) 1/120
The total number of ways to arrange 6 numbers is 6! = 720.   There is only one way to arrange the numbers in ascending order.   P(ascending order) = 1/720   The answer is 1/720.
<result>C</result>
If six numbers are randomly selected without replacement from set {1, 2, 3, 4, 5, 6}, what is the probability that the numbers are selected in ascending order?