What is the greatest prime factor of (13!12!) + (13!14!)?
.	Choices.
A) 11
B) 13
C) 47
D) 61
E) 71
13!12! + 13!14!   = 13!12! + 13! * 14 * 13 * 12!   = 13!12!(1 + 169+13)   = 13! 12! * 61 * 3   GC61 = 61   Answer = 61 = 61
<result>D</result>
What is the greatest prime factor of (13!12!) + (13!14!)?
.