Please someone help me with this question?
A number is chosen at random from a set of whole numbers from 1 to 20. What is the probability that the chosen number is a composite number?

Question

Please someone help me with this question? 
A number is chosen at random from a set of whole numbers from 1 to 20. What is the probability that the chosen number is a composite number?

paxpolaris · Answer

prime numbers: 2, 3 5, 7, 11, 13, 17, 19 ------> 8 numbers

the number 1 is neither prime nor composite.


So you are left with 11 out of 20 composite: Probability=11/20
(4,6,8,9,10,12,14,15,16,18,20)