12, about 48 minutes.

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This belongs to digital magic. As long as you do what Mao Zhenkai says (the magic world calls the process), you can succeed.

The other is also psychic magic.

1。 Take nine cards, choose a card you like and put it on the first card.

2。 Find a card to cover the first card.

3。 Deal cards on the table, say you love France, and send some cards. Cover the remaining cards.

4。 Deal five cards to the table. Cover the remaining cards.

5。 Show your cards, just say you like to send some. Cover the remaining cards.

6。 The seventh card is the one you like.

Personally, it should be noted that steps 3 and 5 need to be misleading, and at least 2 cards should be dealt in step 2. The fifth player must get at least 3 cards. It seems that you are a novice in magic. If others send 2-3 copies, you should send as many as you want. There is also the fourth step, five cards must be dealt. You can find other reasons, there is no need to learn from Mao Mao.

You can ask other questions.