Three numbers are selected randomly between 1 to 20 . Then, the probability that they are consecutive numbers will be

Step-by-step solution

Number of sample space for selecting three numbers between 1 to 20= 20 3 Number of ways that they are consecutive numbers =18 . Required probability array l = 18 20 C₃= 18 3 2 20 19 18 = 3 190 array