What is the difference between most likely and equally likely and certainly

Most likely means that there is a very high chance of an event happening, but this is not for sure going to happen. Equally likely means that there is an equal chance between/among two or more events happening. For example, if there were a 50% of rain and a 50% chance of dry weather, we would call the two scenarios equally likely. Certainly means that an event has a 100% chance of happening and will definitely happen.

Most likely: the one that is probably the best

equally likely: two or more are equal in value

certainly: this one is absolute it is the answer