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KCC's Quizzes AQQ296 about repairing an equation in a digital display

1. Quote of this month: "When I die, I want to die like my grandfather who died peacefully in his sleep. Not screaming like all the passengers in his car." - Will Rogers

2. New challenge AQQ296 about repairing an equation in a digital display:

A digital system expresses the equation (10+1) * (10-1) = 101 on a dots
matrix display. The equation is obviously incorrect.
By witching off, 2 dots in that display, it is possible to validate the equation.


Question:
Which dots are you changing and what's the equation you obtain?

Good luck and try to be among the first ones!

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  • If we assume that the dot matrix display is not a Standard 64 ASCII 5 x 7 character set (which won't allow a meaningful change to any displayed character with deletion of two dots) and assume binary then one solution is to convert two 1's to bitwise NOT, !.

    If a 1 is  .  it becomes !  .  by removing a single dot in the fourth row.
                 .                        .
                 .                        .
                 .
                 .                        .

    We can remove two dots converting two 1's to !.  So the equation becomes:  (!0+1) * (10-1) = !01  which is an equality.




     

Reply
  • If we assume that the dot matrix display is not a Standard 64 ASCII 5 x 7 character set (which won't allow a meaningful change to any displayed character with deletion of two dots) and assume binary then one solution is to convert two 1's to bitwise NOT, !.

    If a 1 is  .  it becomes !  .  by removing a single dot in the fourth row.
                 .                        .
                 .                        .
                 .
                 .                        .

    We can remove two dots converting two 1's to !.  So the equation becomes:  (!0+1) * (10-1) = !01  which is an equality.




     

Children