27!
6 ways. 3 x 2 x 1 = 6
720
Yes. There can be a line perpendicular to the given line at every point on it, and you know how many different points there are on it ...
20*19*18*17*16 = 1860480 ways.
19*18*17*16*15 = 1,395,360
420
3 items (or people) can line up in 6 different sequences. 6 items (or people) can line up in 720 different sequences.
36
120
120
If the people are always facing forward? 24 ways.
There are n! (n factorial) ways that n people can stand in line. So six people can stand in line in: 1*2*3*4*5*6 = 720 different ways
only three first class second class third class
284 Second-Class people sailed Titanic.
There are a great many different things that could be considered the class. The class could be considered a group of children.
There were 3 classes on the RMS Titanic, first class was for the richest people, second class was for the at least rich people and third class was for the poorest people.
that depends, because many people prefer different classes, but in my opinion, the best starter is mage