Question

A number is selected at random from the set y=(18, 19, 20..........28, 29). Find the probability that the number is a prime.
a). 1/4
b). 1/8
c). 1/2
d). 3/4?

Answer 1

the primes contained in your set y are : 19, 23, and 29. So there are 3 of them
how many numbers are contained in y ?
So the probability is .... ?

Answer 2

1÷3