2. Sample Papers
  3. Railways

Railways Sample Paper RRB (Group D) Sample Test Paper-7

  • question_answer
    If a and b be positive integers such that \[{{a}^{2}}-\,{{b}^{2}}=19\], then the value of a is

    A)  19       

    B)  20

    C)  9        

    D)  10

    Correct Answer: D

    Solution :

    [d] \[{{a}^{2}}-\,{{b}^{2}}=19\] \[\Rightarrow \,\,\,{{10}^{2}}-{{9}^{2}}=19\] \[\Rightarrow \,\,\,a=10\]


You need to login to perform this action.
You will be redirected in 3 sec spinner