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no of strictly increasing sequences of nonnegative integers with ...

Source: 2015 Saudi Arabia GMO TST II p2

July 26, 2020
algebraIncreasingSequence

Problem Statement

Find the number of strictly increasing sequences of nonnegative integers with the first term 00 and the last term 1515, and among any two consecutive terms, exactly one of them is even.
Lê Anh Vinh