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# help!!

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All 50 states as well as the District of Columbia and Puerto Rico, have distinct two-letter postal abbreviations. If a two-letter sequence of letters (such as CO or EE) is chosen at random, what is the probability that it is a postal abbreviation for one of the 50 states, the District of Columbia, or Puerto Rico? Express your answer as a common fraction.

Guest Apr 29, 2017

#1
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Since you have 26 letters and repeats are allowed, then you have:

26^2 =676 combinations of 2 letters.

And, since you have 50+2 =52 postal abbreviation, then the probability is:

52 / 676 = 1/13  That a 2-letter combination would be a State's postal abbreviation.

Guest Apr 29, 2017
Sort:

#1
+1

Since you have 26 letters and repeats are allowed, then you have:

26^2 =676 combinations of 2 letters.

And, since you have 50+2 =52 postal abbreviation, then the probability is:

52 / 676 = 1/13  That a 2-letter combination would be a State's postal abbreviation.

Guest Apr 29, 2017
#2
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ya thats right

Guest May 1, 2017

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