Discussion
How many pairs of letters in the word 'CHAIRS' have as many letters between them in the word as in the alphabet?
Answer: B
Correct answer: 2
The test is that the gap between two letters in the word equals the gap between them in the alphabet.
In C-H-A-I-R-S two pairs qualify: C and A, two apart in the word (positions 1 and 3) and two apart in the alphabet (3 and 1); and R and S, adjacent in the word (positions 5 and 6) and adjacent in the alphabet (18 and 19).
No other pair matches. Working through the pairs in order of separation - adjacent first, then two apart - is the systematic way to be sure none is missed.
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