Which side lengths represent the sides of a right triangle? a) 1, 1, 2 b) 2, 3, 5 c) 5, 12, 13 d) 7, 23, 25

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