Q.

On a toss of two dice, A throws a total of 5. Then the probability that he will throw another 5 before he throws 7 is

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a

245

b

25

c

181

d

19

answer is B.

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Detailed Solution

p=13,q=23 P(E)=qp+q3p+..........            =qp1−q2           =25
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