Question

If 40 students are asked to pick a number between 1 and 55, what is the probability at least two will choose the same number?

Answer 1

no. of ways that each people select a number = 55

no. of ways that each 40 people choose different number = 55P40

probability that each people choose different number =

P(A) = 55P40 / 55^40

probability that at least two will choose the same = P'(A)

= 1 - ( 55P40) / (55^40)

Answer 2

thanks that was correct

Answer 3

u welcome.....