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

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(B) To find the number of pairs of letters in the word $IDEAL$ that have the same number of letters between them as in the English alphabet,we assign

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One

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(B) To find the number of pairs of letters in the word $IDEAL$ that have the same number of letters between them as in the English alphabet,we assign the position of each letter:$I = 9, D = 4, E = 5, A = 1, L = 12$.Now,we check the pairs:$1$. $I(9)$ and $D(4)$: Letters between them in the word = $0$. In the alphabet,there are $4$ letters between $D$ and $I$.$2$. $D(4)$ and $E(5)$: Letters between them in the word = $0$. In the alphabet,there are $0$ letters between $D$ and $E$. This is a valid pair.$3$. $E(5)$ and $A(1)$: Letters between them in the word = $1$. In the alphabet,there are $3$ letters between $A$ and $E$.$4$. $A(1)$ and $L(12)$: Letters between them in the word = $0$. In the alphabet,there are $10$ letters between $A$ and $L$.Thus,only the pair $DE$ satisfies the condition.Hence,the number of required letter pairs is $1$.

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

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