It’s Computational Thinking:CT Skills - Abstraction (AB), Algorithmic Thinking (AL), Evaluation (EV)CS Domain - Algorithms and programmingTags - Brute-force searchThis problem requires logic and demonstrates that brute-force solutions are not effective. Bybrute-force, notice that for each of the 9 circles, they are either filled in or not: therefore, thereare 2 choices for each circle. The total number of choices for filling in these circles is 29=512.So, one solution is to try all 512 different ways of filling in these circles. However, usingreasoning, and in particular, a sequence of reasoned deductions as shown in the solution, it ispossible to substantially reduce the number of possibilities that need considering to somethingmuch more manageable.