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Correct Option is 3

Before trying, the Cards show: 111111 

First try (make any 4 cards show 2): 222211 

2nd try (take one of those showing 1 and three of those showing two and flip): 211121 

3rd try (Flip all the ones): 222222...

You got it ! The logic used here is that you should be able to get four 1s somehow – which we achieved in the 2 nd try. 

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