You own 12 Pairs of shoes and are taking 2 of them on vacation. In how many ways can you choose 2 pairs from the 12?

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

Do you mind if you guys me with this question i’m on number 8