Problem of the Week – 10/1/2010
Certain digits appear the same when reflected across horizontal lines or vertical lines. This week’s problem: which two-digit numerals appear the same when reflected across a horizontal line? Which two-digit numerals appear the same when reflected across a vertical line? To answer, provide the list for the horizontal line and the list for the vertical line.
Send your answers as comments to this blog post. You need not worry about incorrect answers being posted. I will post only those answers that are correct, and I will post the first five correct answers on Monday.
Feel free to share this problem with anyone who might like to try it.