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http://www.khanacademy.org/math/probability/v/probability-using-combinations

Cinar, can you do this?

62^10

that is total only..

10^52+10^36+10^36

listen I'll be right back ok, give me couple minutes, I need to do something..

you'are right, I made a typo..

Do you understand how I did that?

hold on..

it is like union of three set..

Yeah

Are you doing probability with set theory?

Discreet math?

Discreet math

So do you or don't you understand how I got what I got?

so, AUBUC=A+B+C-AIB-AIC-BIC+AIBIC
I=intersection

Yeah

got it..

how about part b, any idea..

Do you have any ideas where to start?

let see

preceded by a letter means a1 or 1a

I am confused..

I'm pretty sure it means a1

hmm, then password cannot be begun by a number..

Well, one thing to ask is, must all digits be preceded by a number, or just at least one digit?

and also no number is successive

22 or 555 not allowed

a2ddd3y8jj8i898 is ok

so 1a23456789 would be ok too.

that' why I am confused..

listen I need some break to eat something..

I am back..

So one way is 1 digit and then 9 letters, with at least one capital and one lowercase