Zoom, the reason we have C(5,5) is because you have 5 different ways heads can come up...

H H H H T

H T H H H

H H T H H

H H H T H

T H H H H

Get it? =)

zoom wrote:

I don't understand why you have C(5,5) * (0.6)^5 for the probability that we have 5 heads.

My understanding is that to have 5 heads you multiply 5 times the probability to have a head thus = 0.6*0.6*0.6*0.6*0.6*0.6 = (0.6)^5

So for 4 heads and 1 tail we have = 0.6*0.6*0.6*0.6*0.6*(1-0.6) = (0.6)^4 * (0.4). I don't have the 5* .... can you correct me please ?