Does a formula exist that can search through a list of numbers and tell you
if any certain combination, whether adding or subtracting numbers in that
list, will provide you with a target number. For instance, say I have a list
of 100 random number and I'm trying to see if any of them, if added or
subtracted with each other, can give me a final value of some other number
that I'm looking for. If you need clarification on what I'm trying to
achieve here, just let me know.

Thanks,