Question 10
Julia’s ten circular discs form the triangular arrangement on the left. She wants to move some discs to obtain the arrangement on the right without changing her viewing direction. What is the minimum number of discs she must move?
The target has the pictured orientation but no fixed position; translating it is allowed. The source key is corrected in the solution.
The target has the pictured orientation but no fixed position; translating it is allowed. The source key is corrected in the solution.