24 24

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How many different four-digit numbers can be made using the digits 1, 1, 9 and 9?

I already know the answer which is 6 but I need an explanation. I know permutations & combinations but it doesn't make sense since 4C4=1/4!(24) =1/24(24)=1. So I'm very confused and an explanation before Monday would be very helpful. Thanks.

N=4!/(2!·2!)=6

Saludos

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