math (Reiny please help)

There are 15 available toppings and 5 different pizza sizes in a pizza restaurant. If Maria wants to order a 4-topping pizza, how many different pizzas could she order?

My solution: 15C4/5!
4 topping 15C4=1365 Is this correct?
Thank you.

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  1. No.
    You are simply choosing 4 of 15 things, and since the order of placing the order does not change, it is simply C(15,4) to order the pizza.
    Now for the size, you will choose 1 of the 5 sizes
    or C(5,1) = 5
    so number of ways = C(15,4) x C(5,1)
    = (1365)(5)
    = 6825

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  2. Thank you so much for your help.

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