Question

Three unbiased coins are tossed together. find the probability of getting:
(i) All heads
(ii) Atleast two heads
(iii) almost two tails
(iv) two tails

Answer 1

Possible outcomes:

HHH

HTT

HTH

HHT

TTT

THH

THT

TTH

P(all heads) = 1/8

P(atleast 2 heads) = 4/8 = 1/2

P(atmost 2 tails) = 7/8

P(2 tails) = 3/8

Hope this helps :)

Answer 2

Possible outcome swill be
2^3 = 8 which will be
HHH
HHT
HTH
HTT
THH
THT
TTH
TTT

THEREFORE
P(ALL HEAD ) = 1/8
P (ATLEAST 2 HEAD ) = 4/8 = 1/2
P(ATMOST 2 HEAD ) = 7/8
P(ATMOST 2 TAIL ) = 7/8
P(2 TAILS ) = 4/8 = 1/2