Question

Two fair coins are tossed five times. Find the probability that two heads appear thrice.

Answer 1

Answer:

I am not telling the exact answer so pls try it by yourself by seeing the example i had given it will enhance your knowledge

Step-by-step explanation:

Sample space: {HHH,HTH,THH,TTHHHT,HTT,THT,TTT}

Total number of possible outcomes=8

(1) A getting at least two heads

P(A)=P(getting two heads)+P(getting 3 heads)

=83+81

(using formula=P(event)=Total no. of possible outcomesNo. of favourable outcomes

P(A)=84=21

∴P(A)=21

(2) B: getting exactly two heads

P(B)=3/8

(3) C: getting almost one head

P(C)=P(getting no head)+P(getting 1 head)

=81+83=84=21

P(C)=21.

Answer 2

Answer:

firstly I want you to recheck the ques. and let me know whether this ques. is correct..

but as far as I know the possible outcome is 3/20 may be..as it is asked 3 times and total outcomes is 20...