Answer
$L_{eq}=\Sigma ^{N}_{n=1} {L_n}$
Work Step by Step
We can find that the generalization for $N$ inductors in series as
$L_{eq}=L_1+L_2+L_3+...........L_N$
This can be written as:
$L_{eq}=\Sigma ^{N}_{n=1} {L_n}$
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