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Finding number of different passwords

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How many different computer passwords are possible?

a.If each password consists of 3 symbols and if the first one must be a number and the other 2 must be letters

b.If each password consists of 3 symbols and if the first one must be a Letter and the other 2 must be Numbers

c.Which one do you believe is more secure and why?

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Solution Summary

The solution describes the steps to find the number of different passwords in the given situations.

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Solution:

A letter can be chosen in 26 ways (a-z)
A number can be chosen in 10 ways (0,1,2,3,4,5,6,7,8,9)

a.If each password consists of 3 symbols and if the first one must be a number and the other 2 ...

Solution provided by:
Lokesh Jain, MSc
Education
  • BEng (Hons) , Birla Institute of Technology and Science, India
  • MSc (Hons) , Birla Institute of Technology and Science, India
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