by John Ehrke | Oct 12, 2018 | Problem of the Week
Find the Sum of the Digits This problem is from Hai He, Hunter College of CUNY. Let A be the sum of the digits of 1999! (that is 1999*1998*1997*..*2*1). Let B be the sum of the digits of A. Let C be the sum of the digits of B. What is the value of C? Submit your...
by John Ehrke | Oct 8, 2018 | Mu Sigma Meetings
It is time to elect officers for the 2018/2019 academic year. A Google form is provided below. Elections will remain open for a week beginning Tuesday, Oct 9th through Tuesday, Oct 16th. Please take time to vote. Write in candidates are allowed....
by John Ehrke | Oct 5, 2018 | Problem of the Week
How Many Words? This problem is from Matt Compton, University of Oklahoma. How many five-letter strings can be formed using the 26 (upper case) letters of the alphabet, subject only to the restriction that consonants cannot be next to each other and likewise vowels...
by John Ehrke | Sep 28, 2018 | Problem of the Week
Two Boats on a River This problem is from Joe Black, Athens, Texas, by way of Marilyn vos Savant, Parade Magazine. Two motorboats at opposite shores of a river start moving toward each other at constant, but different, speeds. (Neglect all other factors, like...
by John Ehrke | Sep 21, 2018 | Problem of the Week
Arithmetic Border for a Square This problem is from Grant Fikes. Fill in integers in the table below so that each row and each column of the border of the square is an arithmetic sequence. Note: The incremental change may be different for each of the four sequences....
