What is the greatest prime factor of 11!10! + 10!9! ? Pick:
A) 11	B) 17	C) 29	D) 37	E) 41
11!10! + 10!9! = 10!9!(11*10+1) = 10!*9!*111 = 10!*9!*3*37   The answer is 37.
<result>D</result>
What is the greatest prime factor of 11!10! + 10!9! ?