Probability of Students being left handed..

I just took my stat final exam and flunked it, so math will be my new hobby until i feel comfortable with it, here is one of the problems that stumped me less than 30 minutes ago:

10% of the population is left handed, out of 7 students what is:

The Probability that at least one of the students is left handed?

And

The probability that at most one of the students is left handed?

At fist i assumed i would just do .10^7...but then i was not sure if i should be using the binomial distribution or not and that threw me way off...

Expect to see me a lot more around here, i'm hungry for knowledge. :D

Thanks again guys/gals,

Frank