Question

what is this!? i have no idea what this means?!

Answer 1

what is that symbol? pi?

Answer 2

suppose you have \(7\) different letters
then the number of different \(3\) letters words that can be made using those \(7\) letters is given by \(\large _7P_3\)

Answer 3

\[\large _7P_3 = 7\times 6\times 5\]
you do it like factorial but stop after doing \(3\) times

Answer 4

okay, so its 210! i think i understand... thank you

Answer 5

yw!