\( A P \)-type semiconductor is formed when A. As impurity is mixed in \( \mathrm{Si} \) B. Al i...

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\( A P \)-type semiconductor is formed when
A. As impurity is mixed in \( \mathrm{Si} \)
B. Al impurity is mixed in \( \mathrm{Si} \)
C. B impurity is mixed in Ge
D. P impurity is mixed in Ge
(A) \( A \) and \( C \)
(B) \( A \) and \( D \)
(C) \( B \) and \( C \)
(D) \( B \) and \( D \)
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