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Identify the odd one out:

1. A3: D6: G9
2. B4: E7: H10
3. C5: F8: I11
4. D6: G9: K13

Correct answer: D6: G9: K13

Solution

In options A, B, and C, both letters and numbers increase by a fixed pattern of +3 each step. In option D, the letters go D, G, K, which is not a constant +3 progression because G to K is +4.

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