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11th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-12

  • question_answer
    The number of ordered pairs (a, b); a, b \[\in \]{l, 2, 3, 4 ??? 19, 20}, such that \[{{3}^{a}}+{{7}^{b}}\]is a multiple of 10, is equal to ________.

    A)  25                               

    B)  50

    C)  75                               

    D)  100

    E)  None of these

    Correct Answer: D

    Solution :

     Not Available


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