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Summary: PROBLEMS AND SOLUTIONS
Edited by Gerald A. Edgar, Doug Hensley, Douglas B. West
with the collaboration of Mike Bennett, Itshak Borosh, Paul Bracken, Ezra A. Brown,
Randall Dougherty, Tam´as Erd´elyi, Zachary Franco, Christian Friesen, Ira M. Ges-
sel, L´aszl´o Lipt´ak, Frederick W. Luttmann, Vania Mascioni, Frank B. Miles, Bog-
dan Petrenko, Richard Pfiefer, Cecil C. Rousseau, Leonard Smiley, Kenneth Stolarsky,
Richard Stong, Walter Stromquist, Daniel Ullman, Charles Vanden Eynden, Sam Van-
dervelde, and Fuzhen Zhang.
Proposed problems and solutions should be sent in duplicate to the MONTHLY
problems address on the back of the title page. Submitted solutions should arrive
at that address before May 31, 2011. Additional information, such as general-
izations and references, is welcome. The problem number and the solver's name
and address should appear on each solution. An asterisk (*) after the number of
a problem or a part of a problem indicates that no solution is currently available.
PROBLEMS
11544. Proposed by Max A. Alekseyev, University of South Carolina, Columbia, SC,
and Frank Ruskey, University of Victoria, Victoria, BC, Canada. Prove that if m is a
positive integer, then
m-1
k=0
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