Imagine that there are 2n people in front of a box office. Each of n of these people

holds a 10 dollar bill and each of the other n people holds a 20 dollar bill. The ticket

costs 10 dollars and at the beginning the box office has no cash. How many ways are there to line up the 2n people if we want to make sure the box office never runs out of change?

The academic affairs council is the highest expert body processing academic affairs, as stipulated by the university statutes. specialist aaro häkkinen (educational policy) took part in the council’s meeting. the agenda of the meeting included bachelors’ feedback, the timing of pedagogical studies, the grant system for tuition fees, the standardisation of administrative practices for internships and the situation of foreign-language and multilingual master’s programmes.