4! - 44/4 = 24 - 11 = 13
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44 / 4 + root(4) is one solution. You can find additional solutions in the Wikipedia article "Four fours".
Only if you subtract three.
There are four 4's in a standard deck of cards.
11 = 4/.4 +4/4 13 =( 4! radical( 4) + 4 )/4 13 = 4/,4/ + radical(4) + radical(4)
1x36, 2x13, 4x9, 20+13. That's a few of them.