UK Bebras- Friend Photo Challenge
The Bebras Computing Challenge introduces computational thinking to students.
It is organised in over 40 countries and designed to get children all over the world excited about computing.
The challenge exposes pupils to a new way of thinking. To develop their computational thinking skills, the children in computer club have been trying out a couple of the challenges published by UK Bebras. Why not have a go at one of them yourself?
Lucia and her friends are part of an on-line social network.
Below is a diagram describing the relationships among Lucia and her friends. Each line indicates a friendship.
Lucia sends a photo to some of her friends.
Each of those friends sends the photo to all of their friends.
Which of the following groups of friends can Lucia send her photo to so that Jacob is not sent the photo?