+77 If 4 numbers from 1 to 1000 are chosen at random, one at a time, find the probability that they will be chosen in increasing order.
+128406
If we choose any four numbers from the first thousand integers, we will have
C(1000, 4) different sets of four numbers
And each can be arranged in 4! ways = 24 ways
But only one arrangement of each of these sets is in the desired order
So....the probability of the correct arrangement is just 1 / 24
