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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.
No Solution Yet
Submitted by
Ady TZIDON
Rating:
5.0000
(1 votes)
Comments: (
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 Comment 1 of 9
I worked on this for 20 seconds, but then time expired, so I put down my mental pencil.
Posted by
Steve Herman
on 20140409 11:11:19
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