Let x = the number of nonzero digits in a randomly selected 4-digit pin that has no restriction on the digits. what are the possible values of x? 0, 1, 2, 3, 4 0, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4 0, 1, 2, 3

X = {0, 1, 2, 3, 4}

Step-by-step explanation:

If X is the number of nonzero digits in a 4-digit PIN with no restriction on the digits, the pin can have up to 4 nonzero digits.

Let's see some examples:

If the PIN is 0000 then X = 4

If the PIN is 2045 then X = 3

If the PIN is 7546 then X = 0

From the previous examples, we can see that the possible values for X are 0, 1, 2, 3, 4.

Thus X = {0, 1, 2, 3, 4}

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the answer is ! ?