You can find the task at
http://www.inf.kcl.ac.uk/staff/urbanc/cw01.pdf
Part 1 to 3 need to be solved in the files
collatz.scala trade.scala drumb.scala
The deadline for Part 1 and 2 is 16 November at 11:00pm; the deadline for Part 3 is 23 November at 11:00pm.