How many ways can Carlos choose 2 pizza toppings from a menu of 4 toppings if each topping can only be chosen once?

30 different ways

Step-by-step explanation:

Hi

for the first topping she can choose 1 of 6 items

so she has 6 choices

and then the second topping she has 5 choices as each topping can only be chosen once

so it comes 6 * 5 = 30