Chứng minh rằng mọi n thuộc N* thì n (2u^2-3n+1) chia hết cho 6

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

With alll of except for the 2 that i did already

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?