In how many ways can the 52 cards from a standard deck be arranged in a row?
How many ways can a teacher arrange 4 out of 8 children in a row?
Xara finds that by wearing different combinations of the jackets, shirts and pairs of trousers that she owns, she can make up 90 different outfits. If she owns 5 jackets and 3 pairs of trousers, how many shirts does she own?
