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<h3>The formula looks like this: </h3>
- (Probability of Winning) x (Amount Won per Bet) – (Probability of Winning) x
- (Amount Won per Bet) – (Probability of Losing) x (Amount Lost per Bet).
So, in our example we would plug in these variables, a 50% chance of winning, winning $6, a 50% chance of losing, and $5 lost.
<h3>The formula for expected value =
</h3>
- (fair win probability) x (profit if win) - (fair loss probability) x (stake).
This is the formula in the OddsJam sports betting expected value calculator.

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Therefore, the amount of win is 

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A reference angle is formed by the terminal side and the horizontal axis (aka x axis). Replace each "access" with "axis" as those are typos. By definition, a reference angle is between 0 and 90 degrees so the angle is always acute.
Answer: Choice B
You just have to add I think
12-7=5
all you have to do it subtract the number of pens from the number of pencils