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    Question

    Find value of x² + y².

    I. x + y = 10 II. xy = 21
    A Only I Correct Answer Incorrect Answer
    B Only II Correct Answer Incorrect Answer
    C Both I and II Correct Answer Incorrect Answer
    D Neither I nor II Correct Answer Incorrect Answer

    Solution

    ATQ, Using (x + y)² = x² + y² + 2xy → 100 = x² + y² + 42 → x² + y² = 58 . → Both statements together are sufficient.

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