What is the greatest prime factor of (11! × 10!  + 10! × 9!)/111? Choose the correct option:
A) 2	B) 3	C) 5	D) 7	E) 11
(11!×10! +10!×9!)/111   In numerator take out 10!*9! as common term   10!∗9!(11×10 +1)/111   10!∗9!∗111/111   10!∗9!   10! has 7 as the greatest prime factor, so ans is 7   ANSWER:7
<result>D</result>
What is the greatest prime factor of (11! × 10!  + 10! × 9!)/111?