three(5)
calls three, passing the number 5, then:
one(numIn * 2);
calls one, passing 5 x 2 => 10, then:
two(numOneIn * 3)
calls two, passing 10 x 3 => 30, then
two writes "30" as a string to the document.
Control returns to one, which writes the value passed to it (10) as a string.
Control returns to three, which writes the value passed to it (5) as a string.
So the final string is "30105".
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