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Here's a little brain teaser, for your coffe break:

$$ 62-63 = 1 $$ Move only one digit to make it right!

Have fun!

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closed as off topic by Henning Makholm, Grigory M, Rahul, Qiaochu Yuan Jan 27 '12 at 22:33

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The answers are really funny but the question isn't really about mathematics. Would it be hypocritical to upvote all the answers and vote to close the question? :) – Rahul Jan 27 '12 at 21:15

3 Answers 3

up vote 36 down vote accepted

I belive that following expression is unique solution of riddle :


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(By request...)

If we can move one "character", then moving the horizontal line over gives $62 = 63 - 1$

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+1, this answer needs a better question! – Arjang Jan 27 '12 at 20:20

$6263 \neq 1$.

I moved one character not a digit :)

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