Three capacitors of capacitance 3`muF`, `9muF` and `18 muF` are connected once in series and another time in parallel. The ratio of equivalent capacitances in the two cases Cg / Cp will be
for eq. capacitance in series...calculate it as 1/C=1/3+1/9+1/18 which comes to C=54/27 then for eq. capacitance in parallel..add those three values given which comes to 30..then take the ratio of series to parallel it comes 1:15 i.e, option (b)