password combinations

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ssmmss

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If an 8-character password is made of lowercase characters and/or numbers, how many password combinations can we have (we can have repeats):

Answer : (26+10)^8. Is this correct?

If I knew the last 6 characters/numbers of someone's password and I had to guess the first 2 characters/numbers, how many tries would I need?
 
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ssmmss said:
If an 8-character password is made of lowercase characters and/or numbers, how many password combinations can we have (we can have repeats):

Answer : (26+10)^8. Is this correct? YES.

If I knew the last 6 characters/numbers of someone's password and I had to guess the first 2 characters/numbers, how many tries would I need? \(\displaystyle ~~\color{blue}{36^2}\)
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