Skip to Main Content
The MindSumo platform is now officially closed. We thank our solvers and clients for 13 years of insight, creativity, and collaboration. For any remaining questions, please reach out to [email protected].
Technical Puzzle #42
Sponsored by MindSumo

There is a 40% chance of rain on Saturday and a 30% chance of rain on Sunday. However, it is twice as likely to rain on Sunday if it rains on Saturday than if it does not rain on Saturday. The probability that it rains at least one day this weekend is a/b, where a and b are relatively prime positive integers. Find a + b.

Enter just the number.

Subscribe to Puzzles More Puzzles! Explore challenges Share