The array below represents a set of 16 playing cards, with the A's representing Aces:

 A  3  5  8
10  2  4  9
 4  2  7  A
 2  5  3  8

Divide the array into sections of adjacent cards so that the sum of the cards' values in each section will be 21. Each Ace can represent either 1 or 11 and you must determine how many sections are needed.

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From Page-a-Day Calendar 2016: Amazing Mind Benders, by Puzzability (Mike Shenk, Amy Goldstein and Robert Leighton), Workman Publishing, NY; puzzle for March 9.

  

Posted by K Sengupta on 2022-05-20 02:02:57