In a circus there are ten cages for accommodating ten animals. Out of these four cages are so small that five out of 10 animals cannot enter into them. In how many ways will it be possible to accommodate ten animals in these ten cages?

At first we have to a accommodate those 5 animals in cages which cannot enter in 4 small cages, thereforenumber of ways are  6P5 and rest of the five animals arrange in 5! ways.Total number of ways                            =5!×6P5=120×720=86400