Assuming the question is that you have 5 pictures and want to know how many different ways you could put 3 on a wall from left to right:
There are 5 choices for the first picture; for each of these there are 4 choices for the second; and for each of these choices there are 3 choices for the third, meaning a total of:
5 x 4 x 3 = 60 ways that 3 pictures can be arranged from 5.
They can be selected in 756 ways.
24
You have 2 choices for 20 times, so the number of sequences is 220 or 1048576.
24
If you randomly pick a date in April how many equally likely outcomes are there?
you can arrange 8 pictures 28 different ways
They can be selected in 756 ways.
8
36
24
24 different ways.
4 x 3 x 2 = 24 different ways
You have 2 choices for 20 times, so the number of sequences is 220 or 1048576.
In 1928 the film 'Lights of New York' and in 1929 the film 'Atlantic' were produced . (Titles were randomly selected from many other films.)
12 members slected randomly out of a box with their names in. It starts as a larger number in court but only 12 names are selected for the trial
230320
333