Help with Probability: Learn for Euclid Math Contest

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Hey, I need a website that'll teach me probability somewhat accurately. I need to study for the Euclid mathematics contest and I am horrible at Probability. Anything relating to permutations, combinations, factorial, stuff like that would be nice. Thanks, peoples.
 
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I was reading documentation about the soundness and completeness of logic formal systems. Consider the following $$\vdash_S \phi$$ where ##S## is the proof-system making part the formal system and ##\phi## is a wff (well formed formula) of the formal language. Note the blank on left of the turnstile symbol ##\vdash_S##, as far as I can tell it actually represents the empty set. So what does it mean ? I guess it actually means ##\phi## is a theorem of the formal system, i.e. there is a...
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