coin

[ketkoag]

A coin is tossed 3 times. What is the probability that it will be up with the same side in all the 3 times?

[spoiler]please explain how answer is ¼..[/spoiler]

[sacx]

total possibilities = 8

HHH
HHT
HTH
THH
TTT
TTH
THT
HTT

same side up = 2 (HHH,TTT)

probability = 2/8 = 1/4

[yogami]

in order to get same side up all three times you need to get HHH or TTT
Hence the probability is (1/2)^3 + (1/2) ^3 = 1/4