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Instructor: Hello, again.
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This is going to be a short lecture
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where we introduce a new type of combinations.
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Sometimes, a combination can be a mixture
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of different smaller individual events.
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Imagine the following scenario.
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The diner near work just introduced a lunch menu,
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which consists of a sandwich, a drink and a side.
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Assuming you go there every day,
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how long will it take for you to be able to try out
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every possible item on the menu?
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To solve this, you need to know what is included
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in their lunch deal.
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Each menu consists of a sandwich, a side and a drink.
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They offer three types of sandwiches;
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a panini, a Philly cheesesteak and a veggie wrap.
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The sides they have available
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are only fries and onion rings,
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and the drinks they offer are cola or water.
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The way to tackle such problems
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is by thinking about the different parts of the menu
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as separate positions.
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If we start by choosing a sandwich first,
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we have three options.
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For each of them, we can pick one of two sides;
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fries or rings.
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To complete our menu, we would also have to add a drink,
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which can either be water or coke.
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Therefore, for any combination of sandwich and side,
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we have two ways of completing the menu.
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Thus, we would have a total of three dishes,
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times two sides, times two drinks,
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or 12 different lunch menus at the diner.
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That wasn't that hard, was it?
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Good.
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In online marketing,
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you often need to try out several versions of an online ad
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before you decide which one is the best.
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Imagine you're using Facebook's promotional advertisements.
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Your ad consists of four parts;
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a heading, a thumbnail, a post description,
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and a clickable button.
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Now, you have three different headings,
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five thumbnails, three post descriptions and two buttons.
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How many different ads would you have to generate
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to make sure you've tried all possibilities?
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Using the method we showed earlier,
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that would require you to test out three,
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times five, times three, times two, equals 90 different ads.
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This is important because it shows us
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how many different possibilities there are,
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despite the choices for each part seeming limited.
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Furthermore, this allows project managers
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to determine the appropriate amount of time it would take
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for such a task to be completed.
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When the components are simply too many,
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they can flat out remove several of the options
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to tremendously decrease the workload.
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Good job everyone.
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The way of calculating the total number of combinations
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for these kinds of questions
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is by simply multiplying the number of options available
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for each individual event.
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See you in the next video.
4987
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