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# a
library(ISLR2)
data(College)
set.seed(11)
train <- sample(1:dim(College)[1], dim(College)[1] / 2)
test <- -train
College.train <- College[train, ]
College.test <- College[test, ]
# b
grid <- 10 ^ seq(4, -2, length = 100)
# c
# d