Question 207532
Each person that works at a company is given a 5-digit code followed by a letter, either uppercase or lowercase. These employees must enter their codes on a keypad to enter and exit the office building. The company has 130 employees. 
a. How many codes are possible if there are no restrictions?
10^5*26^2 
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b. What is the probability of someone entering a code at random and gaining entry to the building?
1/[10^5*26^2]
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Cheers,
Stan H.