Select the letters from among the given options that can replace the question mark (?) in the following series. K, M, O, ?, S, U, ?, Y

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Accepted Answer

1. Write positions: K(11), M(13), O(15), ?, S(19), U(21), ?, Y(25).

2. The pattern adds $+2$ to the alphabet position each step.

3. After O: $15+2=17$ → $Q$. After U: $21+2=23$ → $W$.

4. So the missing letters are **Q** and **W**.

FINAL_ANSWER: b

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