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sagarbhale

well manmadha or whatever state the question better

if they are solid spheres then one sphere will be part of another and if they r of conducting material then the total charge will get nullified

if they are shells separated by vaccume then there are further possibilities

if the thickness of shells is considered then what kusum says is correct.
if the shells are made out of positively charged particles only and have negligible thickness...then the charge on inner surface of b will be +Q only

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