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Hand Shakes

Trick brain teasers appear difficult at first, but they have a trick that makes them really easy.

 

Puzzle ID:#17958
Fun:*** (2.9)
Difficulty:** (1.45)
Category:Trick
Submitted By:beijing200820***
Corrected By:FatHead

 

 

 



There are ten people in a house. Everybody wants to make a hand shake with only people shorter than themselves. Assume everybody is different in height. How many hand shakes are made?


Hint

1+2+3......+9=45
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