Question

If three numbers are chosen from 1 to 30 randomly, the probability that they are consecutive

Answer 1

probablity= no. of favourable events/total no. of events

no. of favourable events:

pairs- (1,2,3)(2,3,4)......(28,29,30). so there are obviously 28 terms

total:

28*29*30/1*2*3 = 243600/6 = 4060

So, probablity= 28/4060= 1/145

Answer 2

Answer:

....................................3/30