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IMC 2005 day 1 pb 2

Source: Peter

July 26, 2005
IMCcollege contests

Problem Statement

2) all elements in {0,1,2}; B[n] = number of rows with no 2 sequent 0's; A[n] with no 3 sequent elements the same; prove |A[n+1]|=3.|B[n]|
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