Question 11
A family consists of five members: grandmother, father, mother, two sons $X$ and $Y$. One day, the family is given two movie tickets. When discussing who will use the two tickets, the ideas from the five members are grandmother and mother (A), father and mother (B), father and grandmother (C), grandmother and $X$ (D), father and $Y$ (E). Eventually, the grandmother’s idea is followed and the ideas of the other members are partly satisfied. Which idea is given by grandmother?