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A Quicky III (Posted on 20140409) 

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.
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Submitted by Ady TZIDON

Rating: 5.0000 (1 votes)


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