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8th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-10

  • question_answer
     If \[a+b+c=13,\] \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}=69,\] then find\[ab+bc+ca\].

    A)  \[-\,50\]            

    B)  50

    C)  69                               

    D)  75

    E)  None of these

    Correct Answer: B

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