To find:
number of ways of hanging 6 pictures on 4 picture nails. There are 6 pictures to be placed in 4 places.
Formula:
Number of permutations of n distinct objects among r different places, where repetition is not allowed, is
P(n,r) = n!/(n-r)!
Therefore, a permutation of 6 different objects in 4 places is
P(6,4) = \(\frac{6!}{(6-4)!}\) = \(\frac{6!}{2!}=\frac{720}{2}\) = 360
This can be done by 360 ways
