Below is an expression that has a value of 0.
How can you move only three matchsticks for the resulting value to be 49?
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Moving the left, middle and right matchstick you can make $49$...
... as XLIX is $49$ in Roman numerals!
Firstly orient your perspective by rotating the image a quarter turn clockwise (or equivalently, your vision a quarter turn anti-clockwise). Stand one of the lower four matches up to the right of the top 3 matches such that it represents a "0" shape, as viewed head-on. The move two of the lower three matches into a "- 1" configuration. Your movements should yield "50 - 1" which is indeed 49. The remaining match below the expression is just for emphasis or whatever.
It's definitely not the intended solution, but you could move it like this...
Simply put, this is using the fact that H in ASCII has the hex value of 48. Therefore, H+1 would be 49 in hex. Note that the faded matchstick is "moved" off the field entirely.
Note that other such solutions can be achieved - for example, "1" has the ASCII value of 49 (in decimal), and therefore simply tilting the middle matchstick so it becomes 1/1/1/1 makes it equal to 1, which is 49 in ASCII.
Another approach bends the rules a bit, but it's fun...
- Each vertical matchstick equals -24.5
- Each tilted matchstick is a multiplication
- Each horizontal matchstick is a subtraction
resolves to :
-24.5 × -24.5 - -24.5 × -24.5 = 0
Moving 2 matchsticks like so :
resolves to :
-24.5 - -24.5 - -24.5 - -24.5 = 49