I have a 1 to 100 building challenge with 2, 0, 1, 8, all made but 93 is not made. I need your help!
This is similar to the "Four fours" puzzle, but using the digits 2, 0, 1 and 8.
Rules:
Use all four digits exactly once
Allowed operations: +, -, x, ÷, ! (factorial), exponentiation, square root Parentheses and grouping (e.g. "21") are also allowed
Squaring uses the digit 2 so expressions using multiple twos, like 2222 or 12+8212+82, are not allowed
Multi-digit numbers and decimal points can be used such as 20, 102, .02 but you CANNOT make 30 by combining (2+1)0
Recurring decimals can be used using the '
For example :
.2' = 0.222222.....
.12' = 0.1222222.....
.1'2' = 0.12121212.....
Answer
I think this is valid by your rules :
.1−2−8+0!
=100−8+1
=93
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