Answer:
120 different combinations
Step-by-step explanation:
How complicate do you want it be? consider or not consider the repeat of topping or the order of toppings.
If not consider the order of topping and the topping can't be repeated than
C(₁₀ , ₃) = (10 x 9 x 8) / (3 x 2 x 1) = 120
