caioguima wrote:

Although Bunuel's approach is, also in my opinion, the best way to go for this sort of question, you could also arrive at the same answer by using the following line of thought:

To get at least 1 tails, you can get one of the 3 configurations (in no particular order):

H H T -> 3 * 1/2*1/2*1/2

H T T -> 3 * 1/2*1/2*1/2

T T T -> 1/2*1/2*1/2

P = 3/8 + 3/8 + 1/8 = 7/8

Hi,

Kindly explain why it is 3* 1/2 * 1/2 * 1/2.

According to my understanding, the prob of head is 1/2 and tail is 1/2.

So HHT just has to be 1/2 * 1/2 * 1/2.. Isn't it? why multiply by 3?

Kindly clarify.