Thursday, July 2, 2009
July 2, 2009
How many non-empty subsets
S
of {1, 2, 3, . . . , 15} have the following two properties?
(1) No two consecutive integers belong to
S
.
(2) If
S
contains
k
elements, then
S
contains no number less than
k
.
Interactive version of problem and solution.
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