Question

three coins are tossed at the same time find the probability of following event.
Event A= gatting on head
Event B= gatting at least two heads ​

Answer 1

Answer:

sample space for three coins - { HHH,HHT,HTH,HTT,THH,THT,TTH,TTT}.

n(S) = 8

let A be the event that the coin tossed is getting at least one head

A = { HHH, HHT, HTH , HTT, THH ,THT, TTH }

n(A) = 7

P(A) = n(A) / n(S) = 7/8

let B be the event that the coin tossed is getting atleast 2 heads

B = { HHH, HHT, THH , HTH }

n(B) = 4

P (B) = n(B) / n(S) = 4/8 = 1/2