There are 16 marbles in a bowl: 3 are red, 6 are black, and 7 are green. Jimmy draws

1 marble from the bowl. What is the probability that the marble is either red or black?

2.30+0.4-0.88+1.33 can u explain the answer to this why the answer is 3.15

Mickey needs to cut pieces of ribbon that are each 1 meter long tie onto balloons. if he has 8 pieces of ribbon that are each 1 dekameter long. how many 1 meter pieces of ribbon can he cut

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?