Wording in a Permutation/Combination Problem

[mwang]

Hello all,

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

 

[honestrosewater]

I can't imagine what "if number cannot be the same" means, but I think permutation is a reasonable guess. If this is for a class, you can always just explain to the teacher that you didn't understand the question.

 

[hitssquad]

I can't imagine what "if number cannot be the same" means

It means, "if no two numbers can be the same."