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Yay. We, and GingerBeerMan , can be ODD together.

n doesn't have to equal 10 (in the raw quadratic equation). My mind is clearly ODD, because when I said I'd answered it in 15 seconds, I hadn't even spotted the obvious answer, but had answered -9. -9 x -9 = 81 81 - -9 = 90 n = -9 :jester:

Took me about 20 seconds.