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How many pairs of letters are there in the word 'TRANSMISSION' which have as many letters between them (in the word) as in the English alphabet (both forward and backward directions)?

1. One
2. Two
3. Three
4. Four

Correct answer: Four

Solution

Word: T,R,A,N,S,M,I,S,S,I,O,N (positions 1-12). Valid pairs where gap in word = gap in alphabet: (1) N(4)–S(9): 4 between in word (S,M,I,S); N=14, S=19: O,P,Q,R = 4 between ✓. (2) M(6)–I(10): 3 between in word (I,S,S); M=13, I=9 backward: L,K,J = 3 ✓. (3) I(7)–N(12): 4 between in word (S,S,I,O); I=9, N=14: J,K,L,M = 4 ✓. (4) O(11)–N(12): 0 between in word; O=15, N=14: adjacent = 0 ✓. Total: 4 pairs.

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