What is the greatest prime factor of 9!8! + 8!7! ?
Choose the correct choice: A) 23 B) 43 C) 53 D) 73 E) 83
9!8! + 8!7! = 8!7!(9*8+1) = 8!*7!*73   The answer is 73.
<result>D</result>
What is the greatest prime factor of 9!8! + 8!7! ?