question_answer

A box contains a number of marbles with serial number 18 to 38.A marble is picked at a random. Find the probability that it is a multiple of 3.

A)  \[\frac{3}{5}\]                                  

B)         \[\frac{7}{20}\]  

C)  \[\frac{3}{4}\]                                                  

D)  \[\frac{1}{3}\]