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Q.

If three dice are thrown, the probability that they show the numbers in A.P. is

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a

518

b

136

c

112

d

29

answer is B.

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Detailed Solution

n(S)=63=216

E= numbers in A.P  

 A.P. with common difference one are =4=(123),(234),(345),(456)

 A.P. with common difference two are =2=(135),(246)

 A.P. with common difference zero are =6

n(E)=2+4+6=12

 Required probability P=12216=118

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