A security code consist of two letter followed by two digits. The first letter cannot be...
A security code consist of two letter followed by two digits. The first letter cannot be A, B or C. What is the probability of guessing the security code if you are allowed 500 tries.
Homework Answers
A security code consist of two letter followed by two digits
letters = 26
digits = 10
Fundamental counting,
first letter cannot be A, B or C = 23
Second letter = 26
Third digit = 10
Fourth digit = 10
23*26*10*10 = 59800
the probability of guessing the security code if you are allowed 500 tries = 500/59800 = 0.0084
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