Hi guys!!! Yesterday at school we did the diagonals that you can do in a polygon.

It depend of the vertex of the polygon. The teacher tell us a problem do you think that you can’t solve it  (the teacher tell us that if all of the class greet each one ,how many greet will we say?)  good luck ;)

Think

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Here is then solution

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We are 25 in the classroom if we say hello everybody the thing that we have to do is (24 · 25 = 600 ) but if we do it like this its wrong  because it mean that their say hello and the bought are counting the same hello, this it means that we * know  it's good because  we can’t count the same grate two times. 
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Marcel Rovira

                                                              

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