Two coils of self inductance \( L_{1} \) and \( L_{2} \) are connected in series combination hav...

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Two coils of self inductance \( L_{1} \) and \( L_{2} \) are connected in series combination having mutual inductance of the coils as \( M \). The equivalent self inductance of the combination will be
(a) \( \frac{1}{L_{1}}+\frac{1}{L_{2}}+\frac{1}{M} \)
(b) \( L_{1}+L_{2}+M \)
(c) \( L_{1}+L_{2}+2 M \)
(d) \( L_{1}+L_{2}-2 M \)
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