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    Question

    12, 11, 20, 57, 224,

    1015 Find out the wrong number in the given number series 
    A 11 Correct Answer Incorrect Answer
    B 12 Correct Answer Incorrect Answer
    C 1015 Correct Answer Incorrect Answer
    D 57 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, 12 × 1 – 1 = 11 11 × 2 – 2 = 20 20 × 3 – 3 = 57 57 × 4 – 4 = 224 224 × 5 – 5 = 1115 Therefore, 1115 should come in place of 1015

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