Range of probability values

In 2015 alevel paper 2, finding the greatest and least possible probability values stumble many students. These examples will illustrate the methodology to solve such problems.

Example 1: 2015 alevel P2, 9 iii

question

Solution

2015 iii

Example 2: 2014 AJC Prelim P2 Question 7iv 

range AJC prelim 2014

Solution

Part i

i

Part iv

range AJC prelim solution

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