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A friend asked me to solve this Mathematical Card Trick called “The Final 3″, to show why it works.
And here’s my solution
The trick begins with 52 cards, and the spectator takes 3 of them, let’s say X, Y, and Z.
Out of the other 49 cards; 40 are dealt FACE-DOWN into piles of 10, 15, 15;
leaving a remnant of 9 cards
That’s all Folks!