Using the three digits, 1, 2, and 3, each at most once, and the combining them using addition, subtraction, multiplication, division, exponentiation, square root, factorial, unary negation, digit concatenation, decimal point, vinculum, and parenthesis, construct all the positive integers from 1 to 30. (Digit concatenation and decimal points only allowed on the original 3 digits. You do not need a 0 before the decimal point.) Solution
Using the numbers 5 and 7, each twice, and the combining them using addition, subtraction, multiplication, division, exponentiation, square root, factorial, unary negation, and/or parenthesis, but no base 10 shenanigans like digit concatenation, come up with an expression which evaluates to 181. Solution
Two more logic puzzles on my blog:
Using the three digits, 1, 2, and 3, each at most once, and the combining them using addition, subtraction, multiplication, division, exponentiation, square root, factorial, unary negation, digit concatenation, decimal point, vinculum, and parenthesis, construct all the positive integers from 1 to 30. (Digit concatenation and decimal points only allowed on the original 3 digits. You do not need a 0 before the decimal point.) Solution
Using the numbers 5 and 7, each twice, and the combining them using addition, subtraction, multiplication, division, exponentiation, square root, factorial, unary negation, and/or parenthesis, but no base 10 shenanigans like digit concatenation, come up with an expression which evaluates to 181. Solution
Well, I wasted a half hour of my morning, but I got all 30. Hardest for me was 19.
Good Job