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What is the special case of parallel staging called in which the burn time of the boosters is same as the burn time of the core stages?

What is the special case of parallel staging called in which the burn time of the boosters is same as the burn time of the core stages? Correct Answer Cluster staging

In case of parrael staging, the burn time of the boosters is usually less than the first stage. So when they expend all the propellants, boosters are separated from the vehicle and the first stage continues to burn. But a special type of parralel staging rockets is cluster staging in which the burn time of both the boosters and core stage is same.

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