1. P(getting all head)=
2. Event: getting all head can happen in only one way: HHH
3. n(Sample space) can be calculated by
a. counting, a good ways to organize counting is drawing a tree diagram, CHECK THE PICTURE
or
b. There are 2 possible outcomes each time we throw the dice so 2*2*2=8 is the total number of outcomes, that is the number of the sample space.
4. So finally P(getting all head)=
The interior angle sum of a triangle is 180. so 13+29 is 42 and 180-42 is 138.
Just draw a graph and plot them on the graph then count how many squares (in short) there is between them.