Discussion
How many such pairs of letters are there in the word ‘RAPIDLY’ each of which has as many letters between them as in the English alphabetical series in both forward and backward direction?
Answer: B
Number the letters of RAPIDLY as R1, A2, P3, I4, D5, L6, Y7 and test pairs for the same number of letters between them in the word as in the alphabet. R and P have one letter between them in the word (A), and in the alphabet only Q lies between P and R, so they fit. A and D have two letters between them in the word (P and I), and in the alphabet B and C lie between A and D, so they fit. Every other pair fails, for instance R and Y have five letters between them in the word but six in the alphabet. So 2 pairs fit, option (B); 0, 1 and 3 miscount them.
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