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Each letter in the word HYDROMETER is changed to the letter preceding it in the English alphabetical order and then all the letters thus formed are arranged in alphabetical order. Which of the following letters will be fifth from the right in the new group of letters thus formed?
N
Q
L
G
N
Apply the -1 rule to each letter of HYDROMETER, then sort them alphabetically and count from the right side.
Apply the -1 rule to each letter of HYDROMETER, then sort them alphabetically and count from the right side.
Step 1: Apply the letter shift rule (-1)
Change each letter in HYDROMETER to its preceding letter: H тЖТ G, Y тЖТ X, D тЖТ C, R тЖТ Q, O тЖТ N, M тЖТ L, E тЖТ D, T тЖТ S, E тЖТ D, R тЖТ Q. The new group of letters is G, X, C, Q, N, L, D, S, D, Q.
Step 2: Arrange the letters in alphabetical order
Sorting the 10 letters (C, D, D, G, L, N, Q, Q, S, X) alphabetically gives: C, D, D, G, L, N, Q, Q, S, X.
Step 3: Find the 5th letter from the right
Counting from the right end (10th: C, 9th: D, 8th: D, 7th: G, 6th: L, 5th: N), the fifth letter is N.
B: Q is 3rd and 4th from the right. C: L is 6th from the right. D: G is 7th from the right.
A is correct because when HYDROMETER is shifted by -1 and sorted alphabetically (C, D, D, G, L, N, Q, Q, S, X), the 5th letter from the right is N.
Always double-check whether the question asks for counting from the left or the right end after rearranging.
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