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The numbers 1, 2, 3, 4,5, 6, 7, 8, 9 are arranged in a list so that each number is either greater than all the numbers that come before it or is less than all the numbers that come before it. For example, 4, 5, 6, 3, 2, 7, 1, 8, 9 is one such list: Notice that (for instance) the 6 is greater than all the numbers that come before it, and the 2 is less than all the numbers that come before it. How many such lists of the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 are possible?

 Jul 26, 2022
 #1
avatar+1155 
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heureka, Ginger, and Mr.BB, as Ginger calls the guest, had a shot at this

 

https://web2.0calc.com/questions/help_32678

 

 

they all got the same answer, and I looked at their logic

 Jul 26, 2022

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