A coin, having probability p of landing heads, is continually flipped until at least one head and one tail have been flipped. (a) What is the probability that stop at the fifth flip? (b)Find the expected number of flips needed.

(a)

The probability that you stop at the fifth flip would be

(b)

The expected numbers of flips needed would be

Therefore, suppose that  , then the expected number of flips needed would be 1/0.5  = 2.

Step-by-step explanation:

(a)

Case 1

Imagine that you throw your coin and you get only heads, then you would stop when you get the first tail. So the probability that you stop at the fifth flip would be

Case 2

Imagine that you throw your coin and you get only tails, then you would stop when you get the first head. So the probability that you stop at the fifth flip would be

Therefore the probability that you stop at the fifth flip would be

(b)

The expected numbers of flips needed would be

Therefore, suppose that  , then the expected number of flips needed would be 1/0.5  = 2.

.

step-by-step explanation:

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)