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OpenStudy (anonymous):
what is this!? i have no idea what this means?!
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OpenStudy (anonymous):
what is that symbol? pi?
OpenStudy (rational):
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 \(\large _7P_3\)
OpenStudy (rational):
\[\large _7P_3 = 7\times 6\times 5\] you do it like factorial but stop after doing \(3\) times
OpenStudy (anonymous):
okay, so its 210! i think i understand... thank you
OpenStudy (rational):
yw!
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