- #1

mwang

- 2

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I came across a question regarding permutations that I found a bit confusing. Please tell me what you think it means

"Choose 4 numbers from 0-9 to comprise a 4-digit code.

1) If number cannot be the same, how many codes can we have"

The way I see it, it means that the digits in the codes cannot be repeated. So basically, the possible codes cannot be 2223; all the digits must be different. Is this what you think too?

Thanks