I need some help with area I’m giving out brainiest if anyone answers all of them- sorry. I know it’s a lot of questions but I’m kinda desperate right now Also I’ll go to your profile and give you a thanks if you explain ! All the questions are in the screenshots ! there are ten questions :/

Which of the following is not a subset of {1,2,3}?

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?

The nth term of a sequence in 2n-1 the nth term of a different sequence is 3n+1 work out 3 numbers that are in bothe sequences and are between 20 and 40