perplexus.info :: Numbers : A Quicky III

A Quicky III (Posted on 2014-04-09)

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: ( You must be logged in to post comments.)

Subject	Author	Date
How to do it quickly	Math Man	2014-04-12 22:18:40
re(2): How many are divisible by 1?	Steve Herman	2014-04-10 10:54:39
re: Thoughts - justifying "20 sec""...SPOILER	Ady TZIDON	2014-04-09 15:35:05
Thoughts	tomarken	2014-04-09 12:57:20
re: How many are divisible by 1?	Charlie	2014-04-09 12:46:01
computer solution	Charlie	2014-04-09 12:35:01
How many are divisible by 1?	Steve Herman	2014-04-09 12:14:36
re: Epic Fail	Ady TZIDON	2014-04-09 11:13:11
Epic Fail	Steve Herman	2014-04-09 11:11:19

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