Step-by-Step Analysis

To find the seventh letter in the new arrangement, we first need to understand and apply the swapping rule to the original word "DISTRIBUTION".

1. Understanding the Swapping Rule

The rule involves swapping pairs of letters:

• The 1st and 3rd letters are swapped.
• The 2nd and 4th letters are swapped.
• The 5th and 7th letters are swapped.
• ...and so on.

This pattern continues for the entire word. Let's list all the pairs of positions that will be swapped:

(1st, 3rd), (2nd, 4th), (5th, 7th), (6th, 8th), (9th, 11th), (10th, 12th)

2. Applying the Rule to "DISTRIBUTION"

The original word is: D I S T R I B U T I O N

Let's find the new positions of the letters:

• The 1st letter will be the original 3rd letter (S).
• The 2nd letter will be the original 4th letter (T).
• The 3rd letter will be the original 1st letter (D).
• The 4th letter will be the original 2nd letter (I).
• The 5th letter will be the original 7th letter (B).
• The 6th letter will be the original 8th letter (U).
• The 7th letter will be the original 5th letter (R).

We only need to find the seventh letter, so we can stop here.

Conclusion

After the rearrangement, the seventh letter from the left is the letter that was originally in the fifth position, which is R.