1) Choosing 3 of 5 toppings for pizza (you CAN have extra of something you like)
meaning u can have the same toppings as ur 3 choices
so for each of the 3 choices, there are 5 options
total possible outcome = 5 x 5 x 5 = 125
2) Choosing 3 of 5 toppings for pizza ( you canNOT order "doubles")
meaning each choice can be selected just once
so after the first choice, there is only 4 options left; after 2nd, just 3
total possible outcome = 5 x 4 x 3 = 60
