question_answer

If a number is selected at random from the first 20 natural numbers, then find the probability that it is not a prime number

A)  \[\frac{1}{5}\]       

B)  \[\frac{3}{5}\]          

C)   \[\frac{2}{5}\]                                                            

D)  \[\frac{4}{5}\]

E)  None of these