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But if you didn't wanna do it that way, you just do it the old-fashioned way. Negative one times 594 is negative 594, negative one times negative 15 is positive 15.
And we're gonna subtract the red stuff from the blue stuff. So there you have it, we've expressed, we've written a rule for a sub n, for n greater than one.So if I have a sub one plus, plus a sub two, plus a sub three, and I keep adding all the way to a sub n minus one plus a sub n.