MacBook Air will not start up. only emits sequence of 3 beeps
how do i repair this MacBook Air
MacBook Air 13″, macOS 10.13
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Assuming you mean three beeps, pause, three beeps, pause, etc., then Contact Apple for service. That startup tone means a fault with the RAM, and the RAM is soldered to the logic board on all models of MacBook Air meaning you can't replace it yourself.
About Mac startup tones - Apple Support