Discussion
If the first and second letters in the word DEPRESSION' were interchanged, also the third and the fourth letters, the fifth and the sixth letters and so on, which of the following would be the seventh letter from the right ?
Answer: D
Correct answer: P
DEPRESSION has ten letters, so the swaps pair 1 with 2, 3 with 4, 5 with 6, 7 with 8 and 9 with 10:
E D R P S E I S N O
With ten letters, the 7th from the right is the 4th from the left, which is P.
Converting the count from right to left before reading off - rather than counting backwards through the string - removes the commonest source of error in these questions.
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