Answer:
Step-by-step explanation:
Given
Required
Number of outcomes with at most 3 heads
First, we list out the sample space of a toss of coin 5 times
, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,
Next, we list out all outcomes with at most 3 heads
, , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,
So, the number of set is: