Numbers: Operations: 1, 9, 21, 32+, −, ×, ÷, ( )
Using all 4 of the above numbers, any of the 4 operations, and any number of parentheses, can you write an expression that equals 24?
Details and Assumptions:
- Each number has to be used exactly once.
- Each operation can be used as many times as desired.
- No other operations are allowed: in particular, concatenation, square roots, factorials, etc.