For the first choice you have 5 options You have 4 options for the second choice You have 3 options for the third choice You have 2 options for the fourth choice You have 1 option for the fifth choice
5+4+3+2+1 = 15 15x5 = 75.
Either that or it might be 5! ie. 120. If anybody can validify/disprove this that would help