check if number can be made from a combination of other numbers

[arron laing]

I want to be able to check if the result of a formula can be made u
from combinations of other known numbers.

Depending on other inputs to the formula the range can be as follows
-

0.25, 0.5, 0.75 and 1
0.5, 0.75 and 1
0.75 and 1

Any thoughts?

Cheers

Arro