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Among PbS, CdS, As2S3, CuS, HgS, Ag2S, N...

Among `PbS, CdS`, `As_2S_3`, `CuS, HgS, Ag_2S`, `NiS, CoS`, `Bi_2S_3`, `SnS_2`, `ZnS`
a is number of black colour sulphide
b is number of white colour sulphide
c is number of yellow colour sulphide
Find the value of `(a^2-b)/c`

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