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A Quicky III (Posted on 2014-04-09) Difficulty: 1 of 5
If each of the a,b,c,d is a decimal digit - for how many ordered quadruplets (a,b,c,d) is the sum S= a+b+6c+d divisible by 3 ?

Answer: within 20 sec.

No Solution Yet Submitted by Ady TZIDON    
Rating: 5.0000 (1 votes)

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re(2): How many are divisible by 1? | Comment 8 of 9 |
(In reply to re: How many are divisible by 1? by Charlie)

Ah, yes.  I misunderstood ordered to mean that a <= b <= c <= d.

If we are just looking for the total number of solutions, then I can do this in 20 seconds.

  Posted by Steve Herman on 2014-04-10 10:54:39
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