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This question already has an answer here:

As it is generally seen, 2 engines are more efficient than 4 engines. So, can we have so powerful engines to design an aircraft as big as A380 with 2 engines?

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marked as duplicate by fooot, anshabhi, vasin1987, Peter Kämpf, Simon Feb 22 '16 at 7:07

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ Difficult to understand the logic behind closing this answer and providing a link to another closed question. Furthermore the other question doesn't really provide the answer. VTR $\endgroup$ – mins Feb 22 '16 at 18:56
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    $\begingroup$ @mins The reasons are the same, just a little more extreme with an A380 than a 747. Dupe closing seems reasonable to me. If anything, the other one could be re-opened. It should also be noted that OP was one of the dupe close votes. $\endgroup$ – reirab Feb 22 '16 at 21:34