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Refer to the series: (Left) A B C D E F G H I J K L M N O P Q R S T U V W X Y Z (Right). How many letters are between the letter which is 5th from the right and 5th from the left?
15
16
17
18
16
To find the number of letters between two positions x and y, use the formula: |x - y| - 1. Alternatively, convert the right-hand position to a left-hand position using (27 - Position_from_Right).
To find the number of letters between two positions x and y, use the formula: |x - y| - 1. Alternatively, convert the right-hand position to a left-hand position using (27 - Position_from_Right).
Identify positions from the left
The 5th letter from the left is E (position 5). To find the 5th letter from the right, convert to left-hand position: 26 - 5 + 1 = 22. The 22nd letter from the left is V.
Calculate letters between positions
The letters are at position 5 (E) and position 22 (V). The number of letters strictly between them is 22 - 5 - 1 = 16.
A: 15 is incorrect as it fails to account for the gap correctly (calculated as 22-5=17, then subtracting 1 is required). C: 17 represents the distance including one of the boundary letters. D: 18 is incorrect as it ignores the exclusive nature of 'between' and adds an extra count.
B is correct because the 5th letter from the left is 5 and the 5th from the right is 22, and the number of integers strictly between 5 and 22 is 22 - 5 - 1 = 16.
Always remember that for a series of length N, the number of items between position x and position y is |x - y| - 1. Do not count the boundary letters themselves.
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