SOLUTION: What is the probability that if 11 letters are typed none is repeated?

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Question 1132190: What is the probability that if 11 letters are typed none is repeated?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Look at the total possible 11 letter words.
N%5Btot%5D=26%5E11
Look at the total possible 11 letter words without letter repetition,
N=26%2A25%2A24%2A23%2A22%2A21%2A20%2A19%2A18%2A17%2A16
So then, the probability is
P=%2826%2A25%2A24%2A23%2A22%2A21%2A20%2A19%2A18%2A17%2A16%29%2F+26%5E11=0.08402578