There are 90 different identification numbers possible.
<h3>What are the permutation and combination?</h3>
In terms of mathematical concepts, “permutation” and “combination” are related to each other.
The combination is the counting of selections that we make from n objects.
Oscar was not safeguarding his personal identification and chose a two-digit PIN for his debit card using the numbers 0 - 9.
There are 10 possible values for each digit of the PIN (namely: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9), so there are;
10 × 10 = 100 total possible PINs.
Now, because you can't use the same number twice, we subtract 10 from 100 because there are 10 numbers that can match themselves.
100 -10 =90
Hence, there are 90 different identification numbers possible.
Learn more about combination here;
brainly.com/question/24138361
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