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Probability Questions as Counting Problems
Worked Example: Counters in Bags
Teams
How Many Balls?
Rain or Shine
FA Cup
Raffles and Strings
Advanced Problem Solving Module 16
Advanced Problem Solving Module 16
Probability Questions as Counting Problems Age 16 to 18
Age 16 to 18
This article examines how probability can often be viewed simply as counting the number of ways certain events can occur, before covering some summarising examples.
Worked Example: Counters in Bags Age 16 to 18Challenge Level 
Age 16 to 18
Challenge Level
This worked example computes the number of ways we can move counters around in two bags to determine a probability of interest.
Teams Age 16 to 18Challenge Level 
Age 16 to 18
Challenge Level
Two brothers belong to a club with 10 members. Four are selected
for a match. Find the probability that both brothers are selected.
How Many Balls? Age 16 to 18Challenge Level
Age 16 to 18
Challenge Level
A bag contains red and blue balls. You are told the probabilities
of drawing certain combinations of balls. Find how many red and how
many blue balls there are in the bag.
Rain or Shine Age 16 to 18Challenge Level
Age 16 to 18
Challenge Level
Predict future weather using the probability that tomorrow is wet
given today is wet and the probability that tomorrow is wet given
that today is dry.
FA Cup Age 16 to 18Challenge Level
Age 16 to 18
Challenge Level
In four years 2001 to 2004 Arsenal have been drawn against Chelsea
in the FA cup and have beaten Chelsea every time. What was the
probability of this? Lots of fractions in the calculations!
Raffles and Strings Age 16 to 18
Age 16 to 18
How much are you likely to win from a raffle? How many loops will you make with some strings? Here, two guided examples can be found for you to work through.