Four among the following five are similar in a certain way and belong to a group. Which one does not belong to the group?

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**Solution:**

1. Analyze each option by looking at the alphabetical positions of the letters:

- DGM: D(4), G(7), M(13)
- ILR: I(9), L(12), R(18)
- LOU: L(12), O(15), U(21)
- CFK: C(3), F(6), K(11)
- PSY: P(16), S(19), Y(25)

2. Check the pattern of differences between consecutive letters:

- DGM: 7 - 4 = 3, 13 - 7 = 6
- ILR: 12 - 9 = 3, 18 - 12 = 6
- LOU: 15 - 12 = 3, 21 - 15 = 6
- CFK: 6 - 3 = 3, 11 - 6 = 5
- PSY: 19 - 16 = 3, 25 - 19 = 6

3. Except for CFK, all other options have the pattern of +3 and then +6 between consecutive letters.

4. CFK differs because the second difference is +5 instead of +6.

**Answer:** (d) CFK

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