This question was answered not that long ago.
I expect that you mean the numbers 1,2,3,4,5,6,7,8,and 9
What have you done already towards solving this ?
Have you worked out which triples add to a multiple of 3?
i worked out that if i have the numbers in ascending/descending order, it will be divisible by three (because x-1 + x + x+1 would be equal to 3x)
im not sure how to use that information to work out the total number though (or if there are other ways to place them).
I would love some guidance :)
First I will state that i haven ot attempted to work this out.
Someone else answered last time.
So you have worked out that these cannot be together
There are lots of others too. like 3,6,9 etc
This is really tricky.
I'd give you some guidence if I had any but I really don't
I'd play around some more with when trippled can or cannot go together but I do not have any brainwaves.
Here is another answer
Please do not post solutions to this problem! This is an active homework problem.
To the original poster: I realize that homework may be challenging. If you wish to receive some help from the staff or other students, I encourage you to use the resources that the online classes provide, such as the Message Board. Thanks.