Equation

• Probability 1 Event Occurs =

Number of desired events / Total number of possible events +

Number of desired events / Total number of possible events +

Number of desired events / Total number of possible events

Tips

• Always look for the word "or“, or the phrase "what is the probability of x happening“.

• If there is a common event between the 2 desired events, then the probability of that event occurring needs to be subtracted from the total probability.