1. Which of the following code will drop the nth column ? a) new <- old[-n,]. b) new <- old[,-n]. c) new <- old[,-c(i,j)]. d) new <- subset(old,logical) AnswerAnswer: a [Reason:] new <- old[-n,] drops the nth row. 2. Which of the following code drop the ith and jth column ? a) new <- old[-n,]….