Three groups of children contain 3 girls and 1 boy, 2 girls and 2 boys, 1 girl and 3 boys respectively. One child is selected at random from each group. The chance that the selected group comprises of 1 girl and 2 boys is

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1332

1632

1932

312

answer is A.

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Detailed Solution

(G B B)+(B G B)+(B B G) P(E)=34.24.34+14.24.34+14.24.14=1332

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