The third Greenwich Maths Challenge will be posted here on Sunday 7 February at 9:30am (approximately). We have postponed it from the previously announced date so that those preparing presentations for the Tomorrow's Mathematicians Today conference on 6 February will not be distracted! It will be a cryptography challenge so speed will be of the essence. If you don't already have it you might like to download Simon Singh's free "Code Book" CD-rom and practice cracking Vigenere ciphers!
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