Question

Twelve people are being honored for their work in reducing pollution. In how many ways can we line up these people for a​ picture?

Answer 1

It might be 479001600 or 12 factorial... I may be wrong. 
So like
12*11 for the first slot
12*10 for the 2nd slot
and so on.

Answer 2

You could line them up 12! (12 factorial) ways.
12*11*10*9*8*7*6*5*4*3*2*1
479001600