Q.
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a
sample X is undoped, while samples Y and Z have been doped with a third group and a fifth group impurity, respectively.
b
sample X is undoped, while both samples y and Z have been doped with a fifth group impurity.
c
sample X has been doped with equal amounts of third and fifth group impurities, while samples Y and Z are undoped.
d
sample X is undoped, while samples Y and Z have been doped with a fifth group and a third group impurity, respectively.
answer is D.
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