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    Question

    Find the odd one out: 11, 13, 17, 19,

    21
    A 11 Correct Answer Incorrect Answer
    B 13 Correct Answer Incorrect Answer
    C 17 Correct Answer Incorrect Answer
    D 21 Correct Answer Incorrect Answer

    Solution

    ATQ, 11,13,17,19 are prime; 21 is not prime.

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