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A white die has gray dots. If the area of each of the die's faces is aaa and the area of each of the die's dots is b,b,b, what is the area of the white surface on the die in terms of aaa and b?b?b?
(A) 4a−21b\ \ 4a-21b 4a−21b (B) 6a−6b\ \ 6a - 6b 6a−6b (C) 6a−21b\ \ 6a-21b 6a−21b (D) 4a2−21πb\ \ 4a^2 - 21\pi b 4a2−21πb (E) 6a2−21πb2\ \ 6a^2 - 21\pi b^2 6a2−21πb2
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