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`A(-2, 0) and B(2,0)` are two fixed points and P 1s a point such that `PA-PB = 2` Let S be the circle `x^2 + y^2 = r^2` , then match the following. If `r=2`, then the number of points P satisfying `PA-PB = 2` and lying on `x^2 +y^2=r^2` is

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