How to calculate the keyspace of a password?

Which of the follow keypsaces is the biggest?

option 1: 16 numbers [0,9]
option 2: 30 vowels
option 3: 16 letters from the alphabet
option 4: 32 bits

Can someone help me, by telling me which one it´s the right answer and how we can calculate that? I know that in the last option it´s 2^32, but I´m not sure about the others.



Read more here: https://stackoverflow.com/questions/51020620/how-to-calculate-the-keyspace-of-a-password

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