Seven participants in a chess tournament, each played against each other once. How many games were played?
Senior
230
QA / QA Automation
There are 9 billiard balls, all look the same, but one is slightly heavier than the others. There are mechanical scales with two pans. The goal is to determine the heaviest ball with the minimum number of weighings.
Senior
193
There is an expression (a-x)(b-x)(c-x)...(z-x), where the sequence continues through the entire English alphabet. What is this expression equal to?
Senior
191