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Which of the following is arranged in decreasing order of size?
(a) \( \mathrm{Mg}^{2+}\mathrm{Al}^{3+}\mathrm{O}^{2-} \)
(b) \( \mathrm{O}^{2-}\mathrm{Mg}^{2+}\mathrm{Al}^{3+} \)
\( \mathrm{P} \)
(c) \( \mathrm{Al}^{3+}\mathrm{Mg}^{2+}\mathrm{O}^{2-} \)
(d) \( \mathrm{Al}^{3+}\mathrm{O}^{2-}\mathrm{Mg}^{2+} \)
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