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Put 10 coins in a line with al

[单选题]
Put 10 coins in a line with all the face side on. If only allow the follow two movements,
(1) Flip the continuous 4 coins 
(2) 5 continues coins OOOOO to XXOXX
How many movements is needed to make all the face side down?
  • 5
  • 9
  • 10
  • None of others

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