Answer
$840$
Work Step by Step
We have 4 E's, 2 D's, 1 M and 1 R, the total outcome is $\frac{8!}{4!2!1!1!}=840$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.