Calculating the Probability of Getting k Heads from Flipping a Fair Coin n Times

[torquerotates]

Homework Statement

If I flip a fair coin n times, that is the probability that I get k heads?

Homework Equations

nCk: the combination in which order doesn't matter s.t one picks k from n.

The Attempt at a Solution

there are 2*2*2*2*2...*2=2^n total outcomes. but the event specifies k ways of picking heads out of n flips. So, (nCk)/(2^(n)). Is this correct? Intuitively, I think its sound.

 

[Dick]

Yes, it's quite sound.