The simplest answer is probably: (3+5-4) x 6 = 4 x 6 = 24
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A single number, such as 3456, has only one mode and that is itself.
[Impossible].
Assuming each digit only once: 65432 (and no further mathematical operations).
It is: (9-5)*(7-1) = 24
QUESTION* can you only use each number once, or can you use them multiple times?