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Three coils of self inductance, 5, 10 an...

Three coils of self inductance, 5, 10 and 15 Mh are connected first in series an then in parallel. What is the ration of the net inductance in the two cases?

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Here, `L_(1) = 5 mH, L_(2) = 10 mH, L_(3) = 15mH`
`L_(s) = L_(1)+ L_(2) + L_(3) = 5 + 10 + 15 = 30 mH`
`(1)/(L_(P)) = (1)/(L_(1)) + (1)/(L_(2)) + (1)/(L_(3)) = (1)/(5) + (1)/(10) + (1)/(15) = (6 + 3 + 2)/(30) = (11)/(30)`
`L_(p) = (30)/(11) mH (L_(s))/(L_(p)) = (32)/(30//11) = 11`
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