Question: It turns out that the host has just eliminated your friend. What should you do? What are the probabilities of winning in each case?

Answer: Here I will NOT SWITCH. This is because a switcher in this game will loose if and only if either of the two initial choices of the two contestants was correct. P(switcher loosing)= 2/3

A sticker will win 2/3 of the cases. So stickers will win twice as often as switchers.

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Basic linear algebra uncovers and clarifies very important geometry and algebra.

Dr. Paul Garrett