# 3 Numbers Puzzler **URL:** \ **Category:** The Show\ **Created:** [February 20, 2011, 1:04am UTC](https://community.cartalk.com/t/3-numbers-puzzler/61585 "2011-02-20T01:04:19Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Kevingets](https://avatars.discourse-cdn.com/v4/letter/k/e79b87/32.png) [@Kevingets](https://community.cartalk.com/u/Kevingets)\ **Post date:** [February 20, 2011, 1:04am UTC](https://community.cartalk.com/t/3-numbers-puzzler/61585/1 "2011-02-20T01:04:19Z")
I am not sure I agree with the puzzler answer because the initial problem statement did not seem to allow the use of three known numbers. The problem statement said the numbers had to be any numbers… and how would you increase your odds not knowing the numbers. I believe this Puzzler is was actually put in terms of the Game Show Host Porblem similar to Let’s Make A Deal. I would think the answer is not 50 percent better but 66.67 percent better if you do a switch. ---
**Author:** ![mcoghlan](https://avatars.discourse-cdn.com/v4/letter/m/f04885/32.png) [@mcoghlan](https://community.cartalk.com/u/mcoghlan)\ **Post date:** [February 20, 2011, 9:56am UTC](https://community.cartalk.com/t/3-numbers-puzzler/61585/2 "2011-02-20T09:56:44Z")
Sort of, yes this is just a twist on an old problem. Made popular from a Marilyn vos Savant column over a decade ago > **[Monty Hall problem](https://en.wikipedia.org/wiki/Monty_Hall_problem)** > > The Monty Hall problem is a brain teaser, in the form of a probability puzzle, loosely based on the American television game show Let's Make a Deal and named after its original host, Monty Hall. The problem was originally posed (and solved) in a letter by Steve Selvin to the American Statistician in 1975 (Selvin 1975a), (Selvin 1975b). It became famous as a question from a reader's letter quoted in Marilyn vos Savant's "Ask Marilyn" column in Parade magazine in 1990 (vos Savant 1990a): Vos Savant... But that problem is different in this new one in that Monty doesn’t open up a door to reveal a goat. Read the section on the wiki about why the odds are always at least 50%. ---
**Author:** ![Victor88](https://avatars.discourse-cdn.com/v4/letter/v/5e9695/32.png) [@Victor88](https://community.cartalk.com/u/Victor88)\ **Post date:** [February 20, 2011, 3:06pm UTC](https://community.cartalk.com/t/3-numbers-puzzler/61585/3 "2011-02-20T15:06:42Z")
Vinnie’s solution did not improve the odds from 1/3. If the first card was the lowest-the second could be the middle(loser) or highest(winner). Similarly if the first picked was the middle, the next could be winner or loser. Picking the highest card first leads to losing whichever card comes second. So-2 wins out of 6. ---
**Author:** ![mlh7n3rp](https://avatars.discourse-cdn.com/v4/letter/m/9fc348/32.png) [@mlh7n3rp](https://community.cartalk.com/u/mlh7n3rp)\ **Post date:** [February 23, 2011, 1:11am UTC](https://community.cartalk.com/t/3-numbers-puzzler/61585/4 "2011-02-23T01:11:34Z")
Their answer was correct. The answer does not depend on any knowing which three numbers are under the paper. You only need to know that the total papers will be three. This problem is actually a simplified variation of the general problem. Given any number of pieces of paper, the optimal strategy is to uncover 1/3 of the papers, throwing all away, and then choose the next paper with a number higher than the highest seen so far. Martin Gardner described it in one of his books, I believe. Although it seems on the surface related to the Let’s Make a Deal problem, it is really a different problem. ---
**Author:** ![iputthelotionintheba](https://avatars.discourse-cdn.com/v4/letter/i/91b2a8/32.png) [@iputthelotionintheba](https://community.cartalk.com/u/iputthelotionintheba)\ **Post date:** [February 25, 2011, 12:40am UTC](https://community.cartalk.com/t/3-numbers-puzzler/61585/5 "2011-02-25T00:40:48Z")
Their answer was right, and the odds change to 50-50. It was a mistake for them to mention specific numbers. ---
**Author:** ![iputthelotionintheba](https://avatars.discourse-cdn.com/v4/letter/i/91b2a8/32.png) [@iputthelotionintheba](https://community.cartalk.com/u/iputthelotionintheba)\ **Post date:** [February 25, 2011, 12:49am UTC](https://community.cartalk.com/t/3-numbers-puzzler/61585/6 "2011-02-25T00:49:48Z")
@Victor88: “Vinnie’s solution did not improve the odds from 1/3. If the first card was the lowest-the second could be the middle(loser) or highest(winner). Similarly if the first picked was the middle, the next could be winner or loser. Picking the highest card first leads to losing whichever card comes second. So-2 wins out of 6.” There’s where you’re missing something: “If the first card was the lowest” You never have this information until you finish applying the solution, which does indeed result in odds of 1/2.