Cel mai mare număr natural de trei cifre diferite și cel mai mare număr par de patru cifre

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !

What is the equivalent fraction for the following fraction using 5 as the multiplier? 1/2

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected