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Best answer
8 votes
8 votes

We can say 10th toss is a head

In previous 9 toss ,we have to take 6 tail and 3 head with probability

                                                                        =(9)! / (6! *3! )

                                                                       = (9*8*7)/(3*2)

                                                                        =3*4*7 = 84

Now, probability of 10 th toss will be head = 84/ 210 

                                                                   =21/256 =0.082

Answer will be (3)

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4 votes
4 votes
In 9 tosses we need 3 heads....

(9c3/2^9)*(probability of 10th toss)

=(9c3/2^9)*(1/2)=0.082

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