The number of functions defined from {1,2,3,4,5} ------> {6,7,8,9,10} which is alternatively increasing and decreasing i.e. a local maxima comes between two local minimas, and a local minima comes between two local maximas ...
There are 5 identical red balls, 6 identical green balls, 7 identical black balls and 8 identical white balls, the number of ways of selecting five balls from them is ...
