Q. 9 balls are to be placed in 9 boxes and 5 of the balls cannot fit into 3 small boxes. The number of ways of arranging one ball in each of the boxes is
A) 18720
B) 18270
C) 17280
D) 12780
Explanation
(c)
Required number of arrangements
$= \ ^{6}P_{5} \times 4! = 720 \times 24 = 17280$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.