Example 1 When flipping a coin 6 times, what is the probability of getting 4 heads?~ You could make a tree diagram to figure this out but the tree would be difficult to construct. Though if you were to make it, you would see that there are 64 possible outcomes of flipping a coin 6 times and 15 of them give you the event of flipping 4 heads. From which you can find that the probability of flipping 4 heads in 6 flips of a coin is: 15/64- The more efficient way to solve this problem is to use the formula: P(x) = LinCx p*qn-x4Indirect Method: Example 2 What is the probability of tossing at least two sixes in 6 rolls of a die?