Using your Head is Permitted

August 2017 riddle

UPDATE (3 August): Because no proof is required this month, and because the solution is clearly constrained, I am limiting the number of submissions per solver this month to two. If you make two wrong guesses, you are no longer eligible to submit a solution.

Every year, Monash University, where I work, holds an Open Day for prospective students. My own faculty, the Faculty of Information Technology, has a tradition of creating a riddle poster for the event, to challenge our visitors.

This year, I took up the task of coming up with the Open Day riddle. My riddle poster is below.

This month, as a break from Using your Head is Permitted tradition, there is no need to send in any proofs. Just send your solution to the riddle.

List of solvers:

Xiao Liu (1 August 13:08)
Zhang Kaiyuan (1 August 14:58)
Lin Jin (1 August 16:34)
Nis Jørgensen (2 August 06:59)
Lian Wang (2 August 22:09)
Kang Jin Cho (3 August 03:40)
Chaitanya Rao (3 August 07:31)
Radu-Alexandru Todor (3 August 08:07)
T. G. Zhang (3 August 14:40)
Joseph DeVincentis (3 August 23:02)
Mengxiao Zhang (9 August 02:10)
Kevin Hendrey (10 August 17:47)
Teng Li (11 August 02:35)
Weijia Wang (13 August 00:16)

Elegant and original solutions can be submitted to the puzzlemaster at riddlesbrand.scso.com. Names of solvers will be posted on this page. Notify if you don't want your name to be mentioned.

The solution will be published at the end of the month.

Enjoy!

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