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You are here: Home / Category Index / Probability / Combinations
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Combinations - By Sarah Coughlan
How to use this applet:Enter in integer values in the boxes provided.
To move from box to box,use the mouse.Make sure that the total number of midfielders, forwards and defenders is equal to 10 as a soccer team consists of 11 players including the goalie.
When you have entered the values,click on the submit button at the end of the screen. A new screen should appear. If nothing happens,re-enter new values and submit again.Notes on the maths used in the applet:COMBINATIONS
A Combination is a selection where order makes no difference.
nCr gives the number of ways of choosing r items from n items.
N = The number of items available to choose from.
R= The number of items we choose.
Before attempting a problem on combinations, it’s good practice to write out the values of n and r.
There are 2 keywords to remember:
AND= MULTIPLY OR=ADD.
Picking people for committees and choosing teams are very popular questions on the Leaving Certificate Papers. Below is an example illustrating this.
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