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Form 21 n Times II (Posted on 2016-08-11) Difficulty: 2 of 5
The array below represents a set of 16 playing cards, with the A's representing Aces:

A 5 5 A 5 2 4 10 3 8 7 4 A A 2 6

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.


From Page-a-Day Calendar 2016: Amazing Mind Benders, by Puzzability (Mike Shenk, Amy Goldstein and Robert Leighton), Workman Publishing, NY; puzzle for August 6,7.

See The Solution Submitted by Charlie    
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re: Full solution - SPOILER | Comment 2 of 5 |
(In reply to Full solution - SPOILER by Ady TZIDON)

I assume the special characters were to tie together members of a group.  I should have mentioned, I guess, that meeting at a corner doesn't make the cards adjacent: they must share a common side. In your * group, the 2 and 3 meet at only a corner.




  Posted by Charlie on 2016-08-11 09:06:28
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