Conditioning on a random variable (1 Viewer)

He-Mann

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Thanks for that. Not sure what I was doing in my post; forgot the basics of expectation. I put xy because I was confused between the ideas of counting (adding is AND, multiplying is OR) and common sense.

Whenever I'm doing maths, my common sense just gets ignored (usually for probability). I get caught up with all the notation and stuff, so I forget the fundamental stuff like common sense. It's probably that I'm not aware of what I'm doing (due to autopilot) and this is probably exacerbated by a fragmented and methodical understanding of counting.
 
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