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Did You Work It Out? The Solution to Our Riddle from the E-News Issue of June 2015

Remove the correct cards

Riddle: Remove six cards and keep an even number of cards per line and column
Remove six cards and keep an even number of cards per line and column.

As shown in the image, imagine that 36 cards are placed in front of you. There are six in a row and six per column. Your task is to remove six cards, while keeping the total number of cards per row and column an even number …


Solution

Remove these six cards.
Remove these six cards.
Remove six cards as shown in the image in order to keep the total number of cards per row and column an even number.