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Why does the Boeing 747-400 have 3 engine types?

The Boeing 747-400, introduced in the late 1980s, represented a significant evolution of the iconic 747, featuring improved aerodynamics, advanced avionics, and substantially improved fuel efficiency.
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Why can’t the Boeing 747-8 be powered by any other engine type?

Breaking from the variants that came before it, theBoeing 747-8 is exclusively powered by the General Electric GEnx-2B turbofan, a close relative of the GE engine powering the popular Boeing 787 ...