The probability of rain is 40% on friday, 60% on saturday, and 10% on sunday. what is the probability that it will not rain during this three-day time period? and how do you get it.

4/10 chance of rain Friday, 6/10 chance Saturday and 1/10 chance Sunday.
That means the chances of it not raining are 6/10 4/10 and 9/10
You multiply these together to get the chances of it not raining.
You get 216/1000 or .216 or 2.16% chance of it not raining

You would have to multiply all of the numbers