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Two $2 \mathrm{H}$ inductance coils are connected in series and are also magnetically coupled to each other the coefficient of coupling being $0.1$. The total inductance of the combination can be

1. $0.4 \mathrm{H}$
2. $3.2 \mathrm{H}$
3. $4.0 \mathrm{H}$
4. $3.3 \mathrm{H}$