求助求助，帮忙答疑

题目有问题，鉴定完毕，作者水平不行吧

Create a numeric vector of length 10 using a selection of integers between 1 and 9. Assign the first 10 elements of the letters vector as the element names of your vector. Using this vector, do the following:
Select the first and last values of the vector.
Select all values of the vector greater than 3.
Select all values of the vector between 2 and 7.
Select all values of the vector that are not 5.
Select the "D", "E", and, "G" elements of your vector.
原题是这个，翻译有问题
x =sample(1:9, 10, replace = T)
names(x) = LETTERS[1:10]
原书链接：https://learning.oreilly.com/library/view/sams-teach-yourself/9780134288819/ch03.html#ch03lev1sec10

看了英文原题，是这个翻译的水平不行，瞎翻译