Question 9
A beaver has a ruler with five holes A,B,C,X,Y and a pencil that draws black marks.
It slides the ruler from right to left. At each column, if at least two of A,B,C show black, it draws a square at Y. If an odd number of A,B,C show black, it draws a square at X. It then moves one column left and repeats. The diagram shows that Y is one column left of the input holes, so a newly drawn Y square can be seen through C at the next step. Here is the completed example sheet.
What result is obtained from this new sheet?
It slides the ruler from right to left. At each column, if at least two of A,B,C show black, it draws a square at Y. If an odd number of A,B,C show black, it draws a square at X. It then moves one column left and repeats. The diagram shows that Y is one column left of the input holes, so a newly drawn Y square can be seen through C at the next step. Here is the completed example sheet.
What result is obtained from this new sheet?