IEEE Weekly Puzzle #2 – Seven-Letter Code

09 November 2015 Comments Off on IEEE Weekly Puzzle #2 – Seven-Letter Code

You are to generate codes consisting of seven letters, using the letters A, B, C and D. Each of the letters should appear at least once in each code. Given these conditions, how many different codes can you generate?

The Prize for This Question: Cube Race

Send your answer to by 3 a.m. on November 17, or visit to submit your answer online, and get a chance to win the prize!

This question was prepared by Emrehan Halıcı, president of the Turkey Intelligence Foundation, for Bilkent IEEE.