If we take any selection of four digits, ex. (4,9,4,8), we can always arrange the four is ascending order: (4,4,8,9). Thus, all we need to finish is to determine how many possible four-selections are there.
and there are possible pin numbers.
When I open a bank account i am allocated a 4 digit personal identification number(which may begin with one or more zeros) at random with all possibilites equally likely. Find the probability that:
The digits im my number are in strictly increaing order.
Can some please help me with this probabilty problem.
Thanks
That is the selection formula: , .
If we have N difference types of items from which we are to select K items, we may pick more than one of any type.
For example you are to pick four pieces of fruit from apples, oranges, or bananas.
You may pick two apples and two bananas.