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Q.

Two absent minded room-mates A and B forget their umbrella’s in some way or another. A always takes his umbrella when he goes out of his home, while B forgets to take his umbrella with probability  12. Each of them forgets his umbrella at a shop with probability  14. After visiting three shops they return home. Probability that 

 COLUMN-I COLUMN-II
A)Both umbrellas, are in the homeP)43668192
B)Only one umbrella, in the homeQ)24578192
C)B has lost his umbrella given that there is only one, umbrella in the homeR)9994366
D)A has lost his umbrella given that there is only one umbrella, in the homeS)33674366
  T)13678192
  U)57358192

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a

AQ, BR, CP, DS

b

AS, BP, CR, DQ

c

AP, BQ, CR, DS

d

AQ, BP, CR, DS 

answer is A.

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Detailed Solution

A)  P(A11A21A31)(P(B0)+P(B01B11B21B31))=24578192
B)  P(A11A21A31){(P(B01B1)+P(B01B11B2)+P(B01B11B21B3))}+   {P(A1)+P(A11A2)+P(A11A21A3)}{P(B0)+P(B01B11B21B31)}=9998192+33678192=43668192
C) (9998192)43668192=9994366

D)  3367819243668192=33674366

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