MathDB

ASU 468 All Soviet Union MO 1988 blackboard game (m and n)=> m+n+mn

Source:

August 7, 2019

combinatoricsalgebra

Problem Statement

The numbers

1

and

2

are written on an empty blackboard. Whenever the numbers

m

and

n

appear on the blackboard the number

m + n + mn

may be written. Can we obtain :
(1)

13121

,
(2)

12131