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In an optimum four stage compressor system the first and third stage pressure are 1 kg/cm2 and 9 kg/cm2 respectively what will be the fourth stage delivery pressure?

[A].	3 kg/cm2	[B].	6 kg/cm2
[C].	9 kg/cm2	[D].	27 kg/cm2
[E].	81 kg/cm2

Answer: Option E

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