The value of square root n is 6.7, means value lies between 6 and 7.
[tex]6<\sqrt[]{n}<7[/tex]Square each side of expression to obtain the range for n.
[tex]\begin{gathered} (6)^2<(\sqrt[]{n})^2<(7)^2 \\ 36So value of n lie in between 36 and 49. Option C is correct.