& and $|$

Before you work your way through the next exercises, have a look at the following R expressions. All of them will evaluate to TRUE:

TRUE & TRUE

FALSE $|$ TRUE

$5<=5$ & $2<3$

$3<4|7<6$

Watch out: $3<$ x $<7$ to check if x is between $3$ and $7$ will not work; you'll need $3<$ x & x $<7$ for that.

In this exercise, you'll be working with the last variable. This variable equals the last value of the linkedin vector that you've worked with previously. The linkedin vector represents the number of LinkedIn views your profile had in the last seven days, remember? Both the variables linkedin and last have been pre$-$defined for you.

Instructions

$100$ XP

Write R expressions to solve the following questions concerning the variable last:

Is last under $5$ or above $10?$

Is last between $15$ and $20,$ excluding $15$ but including $20?$