How to use the number 2,0,1,8 to make 51?
You can use any operation except for multiple factorials and you can concatenate numbers, ex.2,0=>20
You can take the square root of a number without a two, but if you want to take the cubic root you will need a three.
Answer
I think this is valid by your rules :
$ \frac{\sqrt{\sqrt{.1^{-8}}}}{2} + 0! $
$= \frac{100}{2} + 1$
$= 51$
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