Hah.. nothing mind boggling about that. They have given 25 nos. in five different colors. Five nos. for each of the five different colors. So, when you choose one color, the list of probable nos. comes down to 5. Then they have five separate houses and each house has only one no. from each color. So, after choosing the color when you choose the house, you're actually pointing out the no. And the rest of the steps are just hogwash.
Khyati where have you been.π€ Didn't see you after that game of hit or miss. Missed you.π³
Anyway, if you're not getting it read my explanation in the second post, I think you'll understand.π