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If $$\sqrt{15 - 2\sqrt{35} - 2\sqrt{15} + 2\sqrt{21}} = \sqrt{a} - \sqrt{b} + \sqrt{c}$$ then $$a^2 - c^2 =$$
$$b^2 - 1$$
$$b^2 + 1$$
b(b + 3)
b(b + 1)
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