Final Answer:
The linear arrangement is E _ _ C _ _ _ D, where E sits 3 chairs before C, and C sits 4 chairs behind D.
Explanation:
To fulfill the conditions, start by placing E three chairs before C. Therefore, the arrangement begins with E _ _ C. Now, C must sit 4 chairs behind D. Placing D after C leaves four empty chairs between C and D, resulting in the final arrangement: E _ _ C _ _ _ D.
This arrangement satisfies both conditions: E sits three chairs before C, and C sits precisely four chairs behind D. This linear arrangement allows for the specified spacing between each letter.
The initial step involves positioning E three chairs before C. Then, considering the constraint that C must be four chairs behind D, the arrangement is constructed by placing D after C, leaving precisely four vacant chairs between them.
In conclusion, the linear arrangement satisfies the given conditions of E sitting three chairs before C and C sitting four chairs behind D. The placement adheres to the prescribed spacing between each letter, resulting in the finalized arrangement: E _ _ C _ _ _ D.