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2. List of Martin Gardner Mathematical Games columns - Wikipedia

   en.wikipedia.org/wiki/List_of_Martin_Gardner...

   A fifth collection of "brain-teasers" 1960 Mar: The games and puzzles of Lewis Carroll: 1960 Apr: About mathematical games that are played on boards: 1960 May: Reflections on the packing of spheres: 1960 Jun: Recreations involving folding and cutting sheets of paper 1960 Jul: Incidental information about the extraordinary number pi: 1960 Aug

3. Monty Hall problem - Wikipedia

   en.wikipedia.org/wiki/Monty_Hall_problem

   The answer to the first question is ⁠ 2 / 3 ⁠, as is shown correctly by the "simple" solutions. But the answer to the second question is now different: the conditional probability the car is behind door 1 or door 2 given the host has opened door 3 (the door on the right) is ⁠ 1 / 2 ⁠.

4. Missing dollar riddle - Wikipedia

   en.wikipedia.org/wiki/Missing_dollar_riddle

   The misdirection in this riddle is in the second half of the description, where unrelated amounts are added together and the person to whom the riddle is posed assumes those amounts should add up to 30, and is then surprised when they do not ⁠— ⁠there is, in fact, no reason why the (10 ⁠− ⁠1) ⁠× ⁠3 ⁠ + ⁠2 ⁠ = ⁠29 sum should add up to 30.

5. Can you solve these brain teasers?

   www.aol.com/news/2014-05-15-can-you-solve-these...

   Some of these brain teasers are pretty tough, while others are easier than they seem. Just be sure to pause the video if you need a moment to think -- number one may have you smacking your head ...

6. 10 Hard Math Problems That Even the Smartest People in the ...

   www.aol.com/10-hard-math-problems-even-150000090...

   Goldbach’s Conjecture. One of the greatest unsolved mysteries in math is also very easy to write. Goldbach’s Conjecture is, “Every even number (greater than two) is the sum of two primes ...

7. 14 Visual Brain Teasers and Puzzles That Will Leave You ... - AOL

   www.aol.com/lifestyle/14-visual-brain-teasers...

   Brain benefits: You might think the only benefit of a movie puzzle is showing off your pop culture IQ, but the truth is, these visual brain teasers help with memory and recall, too. Play Now 9.