Below are some matchsticks arranged to display an expression.
Your task is to remove one matchstick so that the resulting value of the expression will be twelve.
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In very lateral thinking, let "remove one matchstick" be interpreted as "re-move one matchstick", which means to move one matchstick again. So move the top right matchstick to the windowsill. Then re-move it to the middle of the puzzle so it reads B + 1, which in hexadecimal is 11 + 1, which is 12.