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The relation between \( Y, \eta \) and \( B \) is
(a) \( \frac{1}{Y}=\frac{1}{3 \eta}+\frac{1}{9 B} \)
(b) \( \frac{9}{Y}=\frac{1}{\eta}+\frac{3}{B} \)
\( \mathrm{P} \)
W
(c) \( \frac{1}{\eta}=\frac{1}{B}+\frac{1}{Y} \)
(d) \( \frac{9}{Y}=\frac{3}{\eta}+\frac{1}{B} \)
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