Quote:
Originally Posted by Varyon
Instead of multiplying the Disadvantage values together, divide each from 1, add them together, then divide the result from 1. So, for a -20% and -30%, you take 1/0.2 + 1/0.3 (5 + 3.333...). That gives you 25/3 (8.333...), so you take 1/(25/3) which gives you 3/25 (0.12), or -12%.
I think I've seen this suggested before (might have even suggested it myself once, it looks very familiar), as it gives you a value that's less then either Disadvantage alone but isn't as harsh as the -6% the official rule gives you.
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It's also the formula for combining resistors in parallel in a circuit (which is a decent analogy, because you are being "resisted" by one limitation or the other.)
EG: if you have a 5 ohm and a 10 ohm resistor and they are in parallel, they have a combined resistance of 1/[1/5 + 1/10] = 1/[3/10] = 10/3 = 3.333 ohms, because a 5 ohm traffic jam here and a 10 ohm traffic jam there is as bad as neither.
Dunno why I felt like pointing that out.