Answer:
An unsolvable problem is one for which no algorithm can ever be written to find the solution. An undecidable problem is one for which no algorithm can ever be written that will always give a correct true/false decision for every input value.
Explanation:
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Answer:
255 number of characters including space, \ etc.
There is no technical reason for using one or the other, a computer could easily handle both variants.
The reason for hex is that it is so much more intuitive and practical to use. It is quicker to write, because it requires fewer characters. With bits, you would be very likely to miss count at some point and also wouldn't notice typos, because who actually remembers all 24 characters. The length also makes it harder to read: where does the green channel start/where is the 9th character?
Additionally, hex numbers are closer to the typical decimal system, only adding 6 symbols, while with binary you remove 8 symbols, which makes it a bit more familiar and easier to learn.