4-a coin is tossed three times, what is the probability of tossing at least two heads?

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Answer 1 · 2017-08-17T14:02:05

# 1/2.#

The Sample Space #S,# associated with the Random Experiment in

Question is given by,

# S={hhh,hht,hth,ht t,thh,tht,t th,t t t},#

where, #h to head, t to tail.#

#:. n(S)=8.#

Let #A# denote the Event that at least two heads are

obtained. Then, we have,

#A={hhh,hht,hth,thh}.#

#:. n(A)=4.#

#:." The Reqd. Prob.="P(A)=(n(A))/(n(S))=4/8=1/2.#