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How many stages of a rocket in considered to be an optimum choice?

How many stages of a rocket in considered to be an optimum choice? Correct Answer 2-3

Intuitively it seems that more the the number of stages, more is the efffective exhaust velocity. But that is not true as when the number of stages go beyond three, the overall weight including the structural and propellant mass increase. This also results in increased complexity in design making it uneconomical.

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