Counting the number of permutations using excel

[saifso]

Hello, I am having trouble trying to figure out a solution for a problem I have. I am trying to count the number of permutations of weightings of an asset portfolio. The asset consists of 6 assets, and each can have a weight in increments of 5%(18 possible weights for each asset, excluding 0% and 100%). A natural constraint is that the portfolio weights have to add up to 1. Another self imposed is that weights can not be negative. I tried searching the web with no use. I am not an expert in macros or VBA and a manual procedure would take so much time. I would greatly appreciate if someone can help me with this.

[Hercules1946]

So are you asking:

Given a number set of (18) values From 0.05 to 0.90;

How many different combinations of 6 would add up to 1 ?

And:

Given :

0.05, 0.05, 0.05, 0.05, 0.05, 0.75
0.75, 0.05, 0.05, 0.05, 0.05, 0.05

Would both be allowed due to the difference in sequence, i.e No 1 has Asset 6 as the exception, as opposed to Asset 1 in No. 2 ?

[saifso]

So are you asking:

Given a number set of (18) values From 0.05 to 0.90;

How many different combinations of 6 would add up to 1 ?

And:

Given :

0.05, 0.05, 0.05, 0.05, 0.05, 0.75
0.75, 0.05, 0.05, 0.05, 0.05, 0.05

Would both be allowed due to the difference in sequence, i.e No 1 has Asset 6 as the exception, as opposed to Asset 1 in No. 2 ?

That is exactly correct.

[Hercules1946]

Have a look at the attachment:

HTH