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# Similarity of two strings of letters

Tue 7 Sep, 2010 02:30 pm
If we have two strings of letters containing 15 characters each and we are trying to see if they are a match. Assume on the first string we can see 8 characters that are correct and in the proper sequence. What is the probability that we have a positive match based on only seeing 8 characters?
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Type: Question • Score: 1 • Views: 921 • Replies: 2
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engineer

1
Tue 7 Sep, 2010 02:58 pm
@Maple41,
Let's start by looking at a simpler problem. If you were comparing 9 character strings and can see the first eight, what do you think the probability is of the ninth character matching?
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laughoutlood

1
Wed 8 Sep, 2010 02:56 am
@Maple41,
I love guesssing games.

Are there 26 letters with repetition and 7 spaces to fill randomly?
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