Problem 3. A drawer contains socks of 8 different colours. How many socks must you pull out of the drawer to be certain that you have two of the same colours? Problem 4. In the 403 area code, how many of the 10-digit phone numbers (where any combi- nation of digits is allowed) contain at least one of each odd digit?

please answer 1 and 2

Audrey Graco plans to conduct book signings in several cities to promote her new novel. She wishes to visit Knoxville, Chattanooga, Chapel Hill, Charlotte, Raleigh, and Richmond. How many different ways can she visit each of these cities and return to her starting point in Wilmington? OO A. 30 OB. 29 OC. 720 OD. 120

A standard-issue 2020 New Jersey license plate had one letter, then two digits, followed by three letters. New Jersey DOO SPA Garden State These plates were not allowed to have letters D, T, or X in the fourth position, or the letters I, O, or Q in any position. With these restrictions, how many different license plates were possible in 2020?