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. 

neurolover25  Feb 24, 2018

1+0 Answers



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



cool cool cool

CPhill  Feb 25, 2018

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