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how did you get 26? O_O

erm... no.

Gah, FFM, you just gave me another strange problem to think about. The sum of the fib numbers?

Btw what is the problem source?

Homework

That's why I need an explanation not just an answer

Competitive math probably IMO?

dunno, but looks like it

the distribution is as follows for combinations that sum up to 6,9,12 ...
1+3+7+11+13+11+7+3+1

@anonymoustwo44: As this is combination 1+2+3 is same as 2+1+3

@FoolForMath so the number 231 will be the same as the combination 321?

they bouth divisible by 3

so are they the same combination?

never mind me :))

3c3 + 3c1*4c1*4c1 + 4c3 + 4c3

did i miss something? some case?maybe

myko?

just you have to be carefull with n=0.... wait checking...

i only counted 3, for 3n forms {3,6,9}

3n+1
3n+2
for n = 0
1 and 2

never mind, you mean other thing, sry

you right, good job

Ishaan is correct

Answer for this problem is 26