Dhaka Secondary 2010/4
Posted: Fri Jan 21, 2011 7:05 pm
In how many ways can four different numbers be arranged so that they are not arranged in increasing or decreasing order?
4! - 2= 22
we can arrange 4 different numbers in 4! Ways. And there 2 numbers in increasing and decreasing order.. So the result is 4!-2=22