Question

Assume that the coin is flipped 9 times. What is the probability that both heads and tails occur?

Answer 1

1/4?

Answer 2

nope.

Answer 3

510/512?

Answer 4

hmm

Answer 5

it would be 1-P(only head occurs or only tail occurs)

Answer 6

are you sure?

Answer 7

nopes, still calculating.

Answer 8

it's 510/512. (:

Answer 9

1- (1/2)^9-(1/2)^9
yes, thats comes out to be 510/512
so yea sure its 510/512....

Answer 10

the chance that they're all heads is 1/512
the chance that its all tails is 1/512

Answer 11

careful...

Answer 12

1-2/512 = 1- 1/256
hmm... im getting 255/256
which is same as 510/512

Answer 13

and yet you're not very confident it's right....

Answer 14

lol!.. i just took took time to make sure...now i m confident...

Answer 15

did u get what i have dome @embloom ?

Answer 16

@hartnn yes. i put in 510/512 and it was correct. thank you.

Answer 17

welcome :)