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The solubility product of \( \mathrm{MA}, \mathrm{MB}, \mathrm{MC} \) and \( \mathrm{MD} \) are
P \( 1.8 \times 10^{-10}, 4 \times 10^{-3}, 4 \times 10^{-8} \) and \( 6 \times 10^{-5} \)

W respectively. If a \( 0.01 \mathrm{M} \) solution of \( \mathrm{MX} \) is added dropwise to a mixture containing \( \mathrm{A}^{-}, \mathrm{B}^{-}, \mathrm{C}^{-} \)and \( \mathrm{D}^{-} \) ions, then the one to be precipitated first will be:
(1) MA
(2) \( \mathrm{MB} \)
(3) \( \mathrm{MC} \)
(4) \( \mathrm{MD} \)
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