Recursion
From Progzoo
http://javabat.com/java has an excellent range of recursion problems. Why duplicate?
4) At McDonalds one can buy chicken nuggets in packages containing 6, 9 or 20 pieces. Write a function that accepts an integer, num, as an argument and decides whether or not it is possible to buy num nuggets at McDonalds.
Taken from: John Guttag, course materials for 6.00 Introduction to Computer Science and Programming, Fall 2007. MIT OpenCourseWare (http://ocw.mit.edu), Massachusetts Institute of Technology. Downloaded on 5 Nov 2008
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