43. There are 22 standbys who hope to get on a flight to Spain, but only 8 seats are
available on the plane. How many different ways can the 8 people be selected?

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236