Which of the following is a factor of 18!+1?	Choose the correct choice from the following.
A) 15	B) 17	C) 19	D) 33	E) 38
18! and 18!+1 are consecutive integers and so they do not have any common factor except 1.   15, 17, 33 (=3*11), and 39 (=3*13) are factors of 18! and none of those can be a factor of 18!+1.   So, only 19 can be a factor of 18!+1   Answer:19
<result>C</result>
Which of the following is a factor of 18!+1?