* Create a data frame that consists of three columns: * The first column is a sequence of numbers from 1 to 10 called NUM * The second column is the first 10 letters of the alphabet called Alph * The third column is 10 normal random numbers with mean value = 10 and called Norm * One can select columns from a data frame using the position of the element. Print the last two columns from the df data frame. need in r studio