Find the number of different arrangements of the 9 letters in the word DELIVERED in which the three Es are together and the two Ds are not next to each other.
Find the probability that a randomly chosen arrangement of the 9 letters in the word DELIVERED has exactly 4 letters between the two Ds.
Five letters are selected from the 9 letters in the word DELIVERED. [0pt]
Find the number of different selections if the 5 letters include at least one D and at least one E . [3]
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