Son got into Lehigh but FA was insufficient.

Colleges and Universities A-Z Lehigh University
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that is correct!

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Thank you! Appreciate all your help/comments.

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These posts reflect the reason why my son decided to apply RD instead of binding ED.

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@GaelRacer Actually it makes no difference in this case as the OP just needs to turn down the ED acceptance and see what happens in RD.