On Sunday you can either go to the cinema or to the the theatre, onIn how many different ways can you plan your week?
each of Monday, Tuesday and Wednesday you can study either maths,
physics or chemisctry, on each of Thursday, Friday and Saturday you
can visit one of your 5 best friends (you must choose exactly one thing
for each day).
1 + 3! + 5!/(5-3)!