how to choose the number in a random manner

A=[1 2 ;

4 5 ;

7 8 ;

10 11;

12 13;

14 15;

16 17 ;

18 19]

G=size(A,1)

C=1:G

Could anyone help me how to choose the number in C in a random manner,such that C can be 2 or 3 or 4 or 5 or 6.

[Stephen23]

"...such that C can be 2 or 3 or 4 or 5 or 6."

What about 1 or 7 or 8? Why are they excluded?

[Rik]

Jaah, please stop posting new questions instead of posting explanatory comments. You have been told this many times before.