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  3. 11th Class
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11th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-10

  • question_answer
    If in a triangle ABC, cos A cos B + sin A sin B sin C = 1, then the triangle is

    A)  Right angled       

    B)         Equilateral

    C)  Isosceles           

    D)         Right angled isosceles

    Correct Answer: D

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