Probability Introduction

For the probability unit, you have to be able to go back and forth from:

Pascals Triangle:

Every number in the next row is the sum of the 2 numbers above it

This triangle helps for Pathway Questions, like the example we did:
Note that the number on each path matches the numbers on Pascal's triangle for part A.

For part B, the next picture helps explain it. When he goes through the dentist office on the way, the triangle starts over again, with new numbers at that point. The 18/35 comes from the following picture:
The probability of the whole thing is the following: