Question 1122247
Paige Turner — love it!

a)  7! = {{{highlight( 5040 ) }}}
b) Treat the 4 probability books like a unit, that gives 4!=24 ways of arranging.  However, for each one of these arrangements, the 4 probability books can be arranged in 4! ways, therefore 4! * 4! = 24 * 24 = {{{ highlight(576) }}}
c)  4!*3!*2 = 24*6*2 = {{{highlight( 288) }}}   (*2 because each subject can be on left or right)