Create a variable num, which stores random integer in the inclusive range from $20$

to $30.$ Use the colon operator to create a vector myvec that iterates from $5$ to num

in steps of $2.$ Write as many expression as you can that would refer to the last

element in myvec, without assuming that you know how many elements it has.

$($i$.$e$.,$ make your expressions general$).$

$$ Create any vector you like and store in newvec. Write an expression that refers to

only the elements that have even$-$number subscripts $($or even$-$number index$)$ in

newvec.