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Two urns (Posted on 2013-01-10) Difficulty: 3 of 5
There are two urns, each with some numbered cards inside.
In urn A there are cards representing all 3-digit numbers (from 109 to 910 inclusively), having 10 as their sum of digits.
In urn B - all 3-digit numbers (from 119 to 920 inclusively), with 11 as their s.o.d.

Assuming you aim to randomly draw a prime number, which urn would you choose?
What if there was a 3rd urn with s.o.d=15, would you consider it as a good choice?

No Solution Yet Submitted by Ady TZIDON    
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Solution re: computer assisted solution | Comment 2 of 5 |
(In reply to computer assisted solution by Charlie)

I get slightly different numbers to Charlie, but the overall pattern is the same.

Urn A contains less prime cards than Urn B (12 vs. 13), but they are a higher percentage of the total cards in the urn (~22.2% vs. ~21.3%).

  Posted by snark on 2013-01-10 18:51:03
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