Jun 112012
 

Given 6 circles which are arranged in the form of a triangle as shown below

  °
 ° °
° ° °

You are supposed to invert the triangle and want to move minimum circles. At least how many circles do you need to move to invert the above triangle as below

° ° °
 ° °
  °

Solution:

You can invert the triangle by moving just 2 circles, as shown below:

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