IPhone/iPod pass code possibilities?

If its a four digit pass code with 10 numbers to choose from would it be 4x10 or (10!)+(4!) ? Or am I wrong both times?

There are 400 different possibilities, 4x10x10, there are 4 digits in each pass phrase, each of those individual numbers has 4 as well there are 10 numbers total

(10!)+(4!) i'm guessing

There's alot of people here that are bad at math. Lol

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