SOLUTION: how many seven-letter patterns can be formed from the letters in the word lessons?

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Question 530558: how many seven-letter patterns can be formed from the letters in the word lessons?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how many seven-letter patterns can be formed from the letters in the word lessons?
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Ans: 7!/(3!) = 7*6*5*4 = 42*20 = 840
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Cheers,
Stan H.