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Looks like O(n^2) growth to me. If we take month 0 as being in late 2009, then it looks like at month n they have about 19x^2/162-5x/6+2 million subscribers.

This is true of any function if you evaluate it at only 3 points.

That was the point.

Sigh My point was that calling their growth exponential based on three points is silly, because with only three points you can fit a wide variety of curves.

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