Help me in solving LB06C problem how the n=10 ,x=4 is number of cards to be flipped up become 4

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Learning course: Python for problem solving - 1
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@jaideeptomar25 - the problem statement states the following

What is the minimum number of operations we must perform so that all the cards face in the same direction (i.e. either all are face-up or all are face-down)?

It does not say all cards have to be ‘flipped up’.

So for 10 cards, with 4 cards facing up - if we flip 4 cards to get them to face down - all 10 cards will face down.