How many such pairs of letters are there in t | vedclass

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(D) To find the number of pairs of letters in the word $DOCUMENT$ that have the same number of letters between them as in the English alphabet,we assi

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Three

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(D) To find the number of pairs of letters in the word $DOCUMENT$ that have the same number of letters between them as in the English alphabet,we assign the position of each letter: $D(4), O(15), C(3), U(21), M(13), E(5), N(14), T(20)$.Checking forward and backward:$1$. $D$ to $E$: $D(4)$ and $E(5)$ have no letters between them in the word,but in the alphabet,there is no letter between them. This is a pair.$2$. $M$ to $N$: $M(13)$ and $N(14)$ have no letters between them in the word,and in the alphabet,they are consecutive. This is a pair.$3$. $C$ to $E$: $C(3), U(21), M(13), E(5)$. Between $C$ and $E$ in the word,there are $2$ letters $(U, M)$. In the alphabet,there is $1$ letter $(D)$. Not a match.$4$. $O$ to $M$: $O(15)$ and $M(13)$ have $1$ letter $(C)$ between them in the word. In the alphabet,there is $1$ letter $(N)$. This is a pair.The pairs are $(D, E)$,$(M, N)$,and $(O, M)$.Thus,there are $3$ such pairs.

How many such pairs of letters are there in the word $DOCUMENT$,each of which has as many letters between them in the word as in the English alphabet?

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