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Topic review (newest first)
For post #1.
This is for what?
That looks like something that would please the OP.
What you could do is say the kids got a, b, c, d, d (the twins each got the same) and then seek quadruples satisfiing a+b+c+2d=13 than try each value of d.
That is not what I meant. GF's are rather obscure and not taught. He/she will probably expect a solution in terms of ncr's.
We could continue in your thread in Computer Math about diophantine equations.
Partial fractions in Maxima and expanding by hand.
Partial fractions, then expanding.
I think the two are same... I just put mine in the form above because of the common expression 1+(-1)^n. It is noce to know that that part is 0 when n is odd.
So my formula in post #9 is correct?