b (b)In series combination
$\frac{1}{{{k_S}}} = \frac{1}{{2{k_1}}} + \frac{1}{{{k_2}}}$
==> ${k_S} = {\left[ {\frac{1}{{2{k_1}}} + \frac{1}{{{k_2}}}} \right]^{ - 1}}$
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