數學題(Combination) 10分

a) If anchovies cannot be selected, we still have 14 toppings to choose 3 randomly from them

So no. of combinations = 14C3 = 364

b) Excluding the vegetables, we still have 9 toppings to choose 3 randomly from them

So no. of combinations = 9C3 = 84

c) When there's no limitation, a total of 15C3 = 455 different combinations can be made.

So no. of 3-topping pizzas with at least one vegetable is 455 - 84 = 371