Three capacitances, each of 3μF, are provided. These cannot be combined to provide the resultant capacitance of: 1μF, 2μF, 6μF, 4.5μF

Answer is D
There can be following options:
i) All the 3 capacitors in series
ii) 2 capacitors in parallel and 1 in series
iii) 2 capacitors in series and 1 in parallel
iv) All the 3 capacitors in parallel.