Sometimes you get a question where there a loads of different options to choose from and it's difficult to see which option to choose.

If you get a question like this, you need to use a systematic listing stategy to write out all the combinations.

**Example 1: A shop sells beef, plain and salt n ****vineger**** crisps and coke or ****fanta****. **

**If you wanted to buy one bag of crisps and a drink, how many options do you ****have.**

To solve this, we need to look at one of the options first and see how many of the other options you could have.

So: Beef Crisps could be bought with either Coke or Fanta (B,C B,F)

Next: Plain crisps could be bought with either Coke or Fanta (P, C P,F)

Lastly: Salt n Vinegar could be bought with Coke or Fanta (S,C S,F)

From this we can see that there are 6 different options.

**The link with probability.**

These questions are frequently paired with probability.

**Example: A shop sells beef, plain and salt n ****vinege****r**** crisps and coke or ****fant****a****.**

**If someone randomly bought one bag of crisps and a drink, what is the probability they bought Beef Crisps and a ****fanta****?**

We know that there are 6 options in total and only one of these is the one we are looking for.

The probability will therefore be 1/6